diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e5619a3
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+firebase-config.js
diff --git a/MegaPathLogo.jpg b/MegaPathLogo.jpg
new file mode 100644
index 0000000..8d743a7
Binary files /dev/null and b/MegaPathLogo.jpg differ
diff --git a/auth-handler.js b/auth-handler.js
new file mode 100644
index 0000000..9e435a2
--- /dev/null
+++ b/auth-handler.js
@@ -0,0 +1,64 @@
+/*
+ * Authentication Handler Module
+ * Модуль обработки аутентификации
+ *
+ * This module handles Google authentication and guest access functionality
+ * Этот модуль обрабатывает аутентификацию через Google и функционал гостевого доступа
+ */
+
+// Import Firebase modules and configuration
+// Импорт модулей и конфигурации Firebase
+import { auth, provider, db } from "./firebase-init.js";
+import { signInWithPopup } from "https://www.gstatic.com/firebasejs/11.7.3/firebase-auth.js";
+import { doc, setDoc } from "https://www.gstatic.com/firebasejs/11.7.3/firebase-firestore.js";
+
+// Handle Google login button click
+// Обработка клика по кнопке входа через Google
+document.getElementById("google-login").addEventListener("click", async () => {
+  try {
+    // Attempt to sign in with Google popup
+    // Попытка входа через всплывающее окно Google
+    const result = await signInWithPopup(auth, provider);
+    const user = result.user;
+
+    // Create user data object for local storage
+    // Создание объекта данных пользователя для локального хранилища
+    const userData = {
+      name: user.displayName,
+      email: user.email,
+      picture: user.photoURL
+    };
+
+    // Save user data to local storage
+    // Сохранение данных пользователя в локальное хранилище
+    localStorage.setItem("user", JSON.stringify(userData));
+
+    // Save user data to Firestore database
+    // Сохранение данных пользователя в базу данных Firestore
+    await setDoc(doc(db, "users", user.uid), {
+      name: user.displayName,
+      email: user.email,
+      joinedAt: new Date()
+    });
+
+    // Redirect to home page after successful login
+    // Перенаправление на главную страницу после успешного входа
+    window.location.href = "index.html";
+  } catch (err) {
+    // Handle login errors
+    // Обработка ошибок входа
+    console.error("Error in the login:", err.message);
+    alert("Error in login with Google.");
+  }
+});
+
+// Function to handle guest access
+// Функция для обработки гостевого доступа
+export function continueAsGuest() {
+  // Save guest status to local storage
+  // Сохранение статуса гостя в локальное хранилище
+  localStorage.setItem("user", JSON.stringify({ guest: true }));
+  // Redirect to home page
+  // Перенаправление на главную страницу
+  window.location.href = "index.html";
+}
diff --git a/firebase-config.example.js b/firebase-config.example.js
new file mode 100644
index 0000000..b8a02bd
--- /dev/null
+++ b/firebase-config.example.js
@@ -0,0 +1,12 @@
+// This is an example configuration file for Firebase.
+// You should create a file named firebase-config.js and filled with your actual Firebase project configuration values.
+// You can find your Firebase configuration in the group google Drive under MegaPath GoogleCloud/FireBase ID.
+
+export const firebaseConfig = {
+  apiKey: "YOUR_API_KEY_HERE",
+  authDomain: "YOUR_PROJECT.firebaseapp.com",
+  projectId: "YOUR_PROJECT_ID",
+  storageBucket: "YOUR_BUCKET.appspot.com",
+  messagingSenderId: "YOUR_SENDER_ID",
+  appId: "YOUR_APP_ID"
+};
diff --git a/firebase-init.js b/firebase-init.js
new file mode 100644
index 0000000..8629944
--- /dev/null
+++ b/firebase-init.js
@@ -0,0 +1,23 @@
+import { initializeApp } from "https://www.gstatic.com/firebasejs/11.7.3/firebase-app.js";
+import { getAuth, GoogleAuthProvider } from "https://www.gstatic.com/firebasejs/11.7.3/firebase-auth.js";
+import { getFirestore } from "https://www.gstatic.com/firebasejs/11.7.3/firebase-firestore.js";
+import { firebaseConfig } from "./firebase-config.js";
+// Initialize Firebase application
+// Инициализация приложения Firebase
+const app = initializeApp(firebaseConfig);
+
+// Initialize Firebase Authentication and get a reference to the service
+// Инициализация аутентификации Firebase и получение ссылки на сервис
+const auth = getAuth(app);
+
+// Create Google authentication provider instance
+// Создание экземпляра провайдера аутентификации Google
+const provider = new GoogleAuthProvider();
+
+// Initialize Firestore database and get a reference to the service
+// Инициализация базы данных Firestore и получение ссылки на сервис
+const db = getFirestore(app);
+
+// Export initialized Firebase services for use in other modules
+// Экспорт инициализированных сервисов Firebase для использования в других модулях
+export { app, auth, provider, db };
diff --git a/games.html b/games.html
index 50eb45b..28fde8b 100644
--- a/games.html
+++ b/games.html
@@ -1,35 +1,43 @@
+<!--
+  Game Selection Page
+  Страница выбора игры
+
+  This page allows users to select which game they want to play
+  Эта страница позволяет пользователям выбрать, в какую игру они хотят играть
+-->
 <!DOCTYPE html>
 <html lang="en">
 <head>
-  <meta charset="UTF-8">
-  <meta name="viewport" content="width=device-width, initial-scale=1.0">
-  <title>Select a Game</title>
-  <link rel="stylesheet" href="style.css">
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
+  <title>Select Game</title>
+  <!-- Link to external stylesheet
+       Подключение внешней таблицы стилей -->
+  <link rel="stylesheet" href="style.css" />
 </head>
 <body>
   <div class="container">
-    <h1>Select a Game:</h1>
-    <ul>
-      <li><button class="game-button" data-game="flashcard">Flashcards (Match Word & Translation)</button></li>
-      <li><button class="game-button" data-game="word-picture">Match Word & Picture</button></li>
-    </ul>
+    <h1>Select a Game</h1>
+    <!-- Game selection buttons
+         Кнопки выбора игры -->
+    <button class="game-button" data-game="flashcard">Flashcards</button>
+    <button class="game-button" data-game="word-picture">Word & Picture</button>
   </div>
-
   <script>
-    // Extract parameters from URL
+    // Get language and grade parameters from URL
+    // Получение параметров языка и класса из URL
     const urlParams = new URLSearchParams(window.location.search);
-    const selectedLang = urlParams.get('lang');
-    const selectedGrade = urlParams.get('grade');
+    const lang = urlParams.get('lang');
+    const grade = urlParams.get('grade');
 
-    console.log(`Language: ${selectedLang}, Grade: ${selectedGrade}`);
-
-    // Handle game selection
+    // Add click handlers for game selection buttons
+    // Добавление обработчиков клика для кнопок выбора игры
     document.querySelectorAll('.game-button').forEach(button => {
       button.addEventListener('click', () => {
         const gameType = button.dataset.game;
-
-        // Redirect to the game with data
-        window.location.href = play-game.html?lang=${selectedLang}&grade=${selectedGrade}&game=${gameType};
+        // Redirect to the game page with all parameters
+        // Перенаправление на страницу игры со всеми параметрами
+        window.location.href = `play-game.html?lang=${lang}&grade=${grade}&game=${gameType}`;
       });
     });
   </script>
diff --git a/index.html b/index.html
index 8354ca4..d9be6fb 100644
--- a/index.html
+++ b/index.html
@@ -1,27 +1,73 @@
+<!--
+  Language and Grade Selection Page
+  Страница выбора языка и класса
+
+  This page allows users to select their preferred language and grade level
+  Эта страница позволяет пользователям выбрать предпочитаемый язык и уровень класса
+-->
 <!DOCTYPE html>
 <html lang="en">
 <head>
-  <meta charset="UTF-8">
-  <meta name="viewport" content="width=device-width, initial-scale=1.0">
-  <title>Registration</title>
-  <link rel="stylesheet" href="style.css">
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
+  <title>Language & Grade</title>
+  <!-- Link to external stylesheet
+       Подключение внешней таблицы стилей -->
+  <link rel="stylesheet" href="style.css" />
 </head>
 <body>
   <div class="container">
-    <h1>Registration</h1>
-    <form id="registrationForm">
-      <label for="username">Your name:</label>
-      <input type="text" id="username" name="username" required>
-      
-      <label for="password">Password:</label>
-      <input type="password" id="password" name="password" required>
-      
-      <button type="submit">Sign up</button>
-    </form>
-    <div id="message"></div>
+    <h1>Select Language and Grade</h1>
+    <!-- Language selection section
+         Секция выбора языка -->
+    <section>
+      <h2>Language</h2>
+      <button class="language-button">English</button>
+      <button class="language-button">Portuguese</button>
+      <button class="language-button">Russian</button>
+    </section>
+    <!-- Grade selection section
+         Секция выбора класса -->
+    <section>
+      <h2>Grade</h2>
+      <button class="grade-button" data-grade="10">Grade 10</button>
+      <button class="grade-button" data-grade="11">Grade 11</button>
+      <button class="grade-button" data-grade="12">Grade 12</button>
+    </section>
   </div>
-  <script src="script.js"></script>
- <script src="updated_words_data.js" defer></script>
-<script src="script.js" defer></script>
+  <script>
+    // Initialize page when DOM is fully loaded
+    // Инициализация страницы после полной загрузки DOM
+    document.addEventListener("DOMContentLoaded", () => {
+      // Variables to store user selections
+      // Переменные для хранения выбора пользователя
+      let selectedLanguage = null;
+      let selectedGrade = null;
+
+      // Add click handlers for language buttons
+      // Добавление обработчиков клика для кнопок выбора языка
+      document.querySelectorAll('.language-button').forEach(button => {
+        button.addEventListener('click', () => {
+          selectedLanguage = button.textContent.toLowerCase();
+          alert(`Selected: ${selectedLanguage}`);
+        });
+      });
+
+      // Add click handlers for grade buttons
+      // Добавление обработчиков клика для кнопок выбора класса
+      document.querySelectorAll('.grade-button').forEach(button => {
+        button.addEventListener('click', () => {
+          selectedGrade = button.dataset.grade;
+          // Redirect to games page if both selections are made
+          // Перенаправление на страницу игр, если сделаны оба выбора
+          if (selectedLanguage && selectedGrade) {
+            window.location.href = `games.html?lang=${selectedLanguage}&grade=${selectedGrade}`;
+          } else {
+            alert("Select language and grade.");
+          }
+        });
+      });
+    });
+  </script>
 </body>
 </html>
diff --git a/login.html b/login.html
new file mode 100644
index 0000000..b7e4e2a
--- /dev/null
+++ b/login.html
@@ -0,0 +1,34 @@
+<!--
+  Login Page
+  Страница входа
+
+  This page provides options for users to login with Google or continue as a guest
+  Эта страница предоставляет пользователям возможность войти через Google или продолжить как гость
+-->
+<!DOCTYPE html>
+<html lang="pt-BR">
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
+  <title>Login - Duoli Flashcards</title>
+  <!-- Link to external stylesheet
+       Подключение внешней таблицы стилей -->
+  <link rel="stylesheet" href="style.css" />
+</head>
+<body>
+  <div class="container">
+    <h1>Welcome To MegaPath</h1>
+    <!-- Google login button
+         Кнопка входа через Google -->
+    <button id="google-login">Enter With Google Account</button>
+    <p>ou</p>
+    <!-- Guest access button
+         Кнопка гостевого доступа -->
+    <button onclick="continueAsGuest()">Continue As Guest</button>
+  </div>
+
+  <!-- Import authentication handler module
+       Импорт модуля обработчика аутентификации -->
+  <script type="module" src="./auth-handler.js"></script>
+</body>
+</html>
diff --git a/play-game.html b/play-game.html
index 9f905c5..8dd9e0c 100644
--- a/play-game.html
+++ b/play-game.html
@@ -1,49 +1,139 @@
+<!--
+  Game Play Page
+  Страница игры
+
+  This page implements the flashcard game functionality and word-picture matching game (coming soon)
+  Эта страница реализует функционал игры с карточками и игры на сопоставление слов с картинками (в разработке)
+-->
 <!DOCTYPE html>
 <html lang="en">
 <head>
-  <meta charset="UTF-8">
-  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
   <title>Play Game</title>
-  <link rel="stylesheet" href="style.css">
+  <link rel="stylesheet" href="style.css" />
 </head>
 <body>
   <div class="container">
     <h1 id="game-title"></h1>
     <div id="game-container"></div>
   </div>
-
+  <!-- Import word data and game logic
+       Импорт данных слов и логики игры -->
+  <script src="updated_words_data.js"></script>
   <script>
-    // Extract parameters
+    // Get game parameters from URL
+    // Получение параметров игры из URL
     const urlParams = new URLSearchParams(window.location.search);
     const lang = urlParams.get('lang');
     const grade = urlParams.get('grade');
     const game = urlParams.get('game');
-
-    const wordsData = {
-      "10": {
-        hebrew: [
-          { word: "אטום", translation: { hebrew: "אטום", english: "atom", portuguese: "átomo", russian: "атом" } },
-          { word: "מולקולה", translation: { hebrew: "מולקולה", english: "molecule", portuguese: "molécula", russian: "молекула" } }
-        ]
-      },
-      // Add data for grades 11 and 12
-    };
-
-    const gameContainer = document.getElementById('game-container');
     const gameTitle = document.getElementById('game-title');
+    const gameContainer = document.getElementById('game-container');
+    const words = gradesData[grade];
 
-    // Display game based on selection
-    if (game === "flashcard") {
+    // Check if words exist for selected grade
+    // Проверка наличия слов для выбранного класса
+    if (!words) {
+      gameContainer.innerHTML = "<p>No words for this grade.</p>";
+    } else if (game === "flashcard") {
+      // Flashcard game implementation
+      // Реализация игры с карточками
       gameTitle.textContent = "Flashcards";
-      const words = wordsData[grade];
-      words.hebrew.forEach(item => {
-        const card = document.createElement('div');
-        card.textContent = ${item.word} - ${item.translation[lang]};
-        gameContainer.appendChild(card);
-      });
-    } else if (game === "word-picture") {
-      gameTitle.textContent = "Match Word & Picture";
-      gameContainer.textContent = "Feature coming soon!";
+      let currentIndex = 0;
+      let score = 0;
+      let wrongWords = [];
+
+      // Function to display current flashcard
+      // Функция для отображения текущей карточки
+      function showCard() {
+        if (currentIndex >= words.length) {
+          gameContainer.innerHTML = `
+            <h2>You Finished The Game!</h2>
+            <p>Your Pontuation: ${score} de ${words.length}</p>
+            <h3>Your missed words:</h3>
+            <ul>${wrongWords.map(w => `<li>${w}</li>`).join('')}</ul>
+          `;
+          return;
+        }
+
+        // Display current word and input form
+        // Отображение текущего слова и формы ввода
+        const word = words[currentIndex];
+        gameContainer.innerHTML = `
+          <h2>${word.word}</h2>
+          <input type="text" id="answer-input" placeholder="Type the translation" />
+          <button id="check-answer">Check Answer</button>
+          <p id="feedback"></p>
+          <p id="correct-answer" style="display:none;">Correct answer: ${word.translation[lang]}</p>
+          <button id="next">Next</button>
+          <button id="finish">Finish Game</button>
+        `;
+
+        const input = document.getElementById("answer-input");
+        const feedback = document.getElementById("feedback");
+        const correctAnswer = document.getElementById("correct-answer");
+
+        // Check answer button handler
+        // Обработчик кнопки проверки ответа
+        document.getElementById("check-answer").addEventListener("click", () => {
+          const userAnswer = input.value.trim().toLowerCase();
+          const correct = word.translation[lang].toLowerCase();
+
+          if (userAnswer === correct) {
+            feedback.textContent = "✅ Correct!";
+            score++;
+          } else {
+            feedback.textContent = "❌ Wrong.";
+            wrongWords.push(`${word.word} → ${word.translation[lang]}`);
+          }
+          correctAnswer.style.display = "block";
+        });
+
+        // Next button handler
+        // Обработчик кнопки "Следующий"
+        document.getElementById("next").addEventListener("click", () => {
+          currentIndex++;
+          showCard();
+        });
+
+        // Finish game button handler
+        // Обработчик кнопки завершения игры
+        document.getElementById("finish").addEventListener("click", () => {
+          showFinalResult();
+        });
+
+        // Enter key handler for answer submission
+        // Обработчик клавиши Enter для отправки ответа
+        input.addEventListener("keypress", (e) => {
+          if (e.key === "Enter") {
+            document.getElementById("check-answer").click();
+          }
+        });
+
+        input.focus();
+      }
+
+      // Function to show final game results
+      // Функция для показа финальных результатов игры
+      function showFinalResult() {
+        gameContainer.innerHTML = `
+          <h2>Game Over</h2>
+          <p>Your score: ${score} out of ${words.length}</p>
+          <h3>Incorrect words:</h3>
+          <ul>${wrongWords.map(w => `<li>${w}</li>`).join('')}</ul>
+          <button onclick="window.location.href='index.html'">Play Again</button>
+        `;
+      }
+
+      // Start the game
+      // Начать игру
+      showCard();
+    } else {
+      // Word-picture game placeholder
+      // Заглушка для игры сопоставления слов с картинками
+      gameTitle.textContent = "Coming Soon";
+      gameContainer.innerHTML = "<p>Word-to-picture not available yet.</p>";
     }
   </script>
 </body>
diff --git a/script.js b/script.js
index 27f612a..0eac900 100644
--- a/script.js
+++ b/script.js
@@ -1,27 +1,45 @@
-// Get form and message elements
+/*
+ * Registration Form Handler
+ * Обработчик формы регистрации
+ *
+ * This script handles user registration functionality using localStorage
+ * Этот скрипт обрабатывает функционал регистрации пользователей с использованием localStorage
+ */
+
+// Get form and message elements from the DOM
+// Получение элементов формы и сообщения из DOM
 const form = document.getElementById('registrationForm');
 const messageDiv = document.getElementById('message');
 
-// Handle form submission
+// Handle form submission event
+// Обработка события отправки формы
 form.addEventListener('submit', (e) => {
-  e.preventDefault(); // Prevent page reload
+  // Prevent default form submission behavior
+  // Предотвращение стандартного поведения отправки формы
+  e.preventDefault();
 
+  // Get username and password values from form inputs
+  // Получение значений имени пользователя и пароля из полей формы
   const username = document.getElementById('username').value;
   const password = document.getElementById('password').value;
 
-  // Retrieve users from LocalStorage
+  // Retrieve existing users from LocalStorage or initialize empty array
+  // Получение существующих пользователей из LocalStorage или инициализация пустого массива
   let users = JSON.parse(localStorage.getItem('users')) || [];
 
-  // Check if the user already exists
+  // Check if user already exists with same credentials
+  // Проверка существования пользователя с такими же учетными данными
   const userExists = users.some(user => user.username === username && user.password === password);
 
   if (!userExists) {
-    // Add the new user if they don't exist
+    // Add new user to the users array and save to localStorage
+    // Добавление нового пользователя в массив и сохранение в localStorage
     users.push({ username, password });
     localStorage.setItem('users', JSON.stringify(users));
   }
 
-  // Redirect to the language selection page
+  // Redirect user to language selection page
+  // Перенаправление пользователя на страницу выбора языка
   window.location.href = 'language.html';
 });
 
diff --git a/style.css b/style.css
index 8b13789..2bb6cd2 100644
--- a/style.css
+++ b/style.css
@@ -1 +1,25 @@
+/*
+ * Main Stylesheet
+ * Основная таблица стилей
+ *
+ * This CSS file contains basic styling for the application layout and buttons
+ * Этот CSS файл содержит базовые стили для макета приложения и кнопок
+ */
 
+/* Container styles - centers content and sets maximum width
+   Стили контейнера - центрирует содержимое и устанавливает максимальную ширину */
+.container {
+  max-width: 600px;
+  margin: auto;
+  text-align: center;
+  padding: 2em;
+}
+
+/* Button styles - defines common button appearance
+   Стили кнопок - определяет общий вид кнопок */
+button {
+  padding: 10px 20px;
+  margin: 10px;
+  font-size: 16px;
+  cursor: pointer;
+}
\ No newline at end of file
diff --git a/updated_words_data.js b/updated_words_data.js
index 376f8df..c0f1318 100644
--- a/updated_words_data.js
+++ b/updated_words_data.js
@@ -1,20 +1,160 @@
 const gradesData = {
-  "10": [  // Grade 10
-    { word: "אטום", translation: { hebrew: "אטום", english: "atom", russian: "атом", portuguese: "átomo" } },
-    { word: "מולקולה", translation: { hebrew: "מולקולה", english: "molecule", russian: "молекула", portuguese: "molécula" } },
-    { word: "אנרגיה", translation: { hebrew: "אנרגיה", english: "energy", russian: "энергия", portuguese: "energia" } },
-    { word: "תא", translation: { hebrew: "תא", english: "cell", russian: "клетка", portuguese: "célula" } },
+  "10": [
+    { word: "אטום", translation: { portuguese: "átomo", english: "atom", russian: "атом" } },
+    { word: "מולקולה", translation: { portuguese: "molécula", english: "molecule", russian: "молекула" } },
+    { word: "תרכובת", translation: { portuguese: "composto", english: "compound", russian: "соединение" } },
+    { word: "חלבון", translation: { portuguese: "proteína", english: "protein", russian: "белок" } },
+    { word: "פחמימה", translation: { portuguese: "carboidrato", english: "carbohydrate", russian: "углевод" } },
+    { word: "שומן", translation: { portuguese: "gordura", english: "fat", russian: "жир" } },
+    { word: "נוקלאוטיד", translation: { portuguese: "nucleotídeo", english: "nucleotide", russian: "нуклеотид" } },
+    { word: "דנ״א", translation: { portuguese: "DNA", english: "DNA", russian: "ДНК" } },
+    { word: "רנ״א", translation: { portuguese: "RNA", english: "RNA", russian: "РНК" } },
+    { word: "קרום התא", translation: { portuguese: "membrana celular", english: "cell membrane", russian: "клеточная мембрана" } },
+    { word: "דיפוזיה", translation: { portuguese: "difusão", english: "diffusion", russian: "диффузия" } },
+    { word: "אוסמוזה", translation: { portuguese: "osmose", english: "osmosis", russian: "осмос" } },
+    { word: "הומאוסטזיס", translation: { portuguese: "homeostase", english: "homeostasis", russian: "гомеостаз" } },
+    { word: "תא", translation: { portuguese: "célula", english: "cell", russian: "клетка" } },
+    { word: "תא אאוקריוטי", translation: { portuguese: "célula eucariótica", english: "eukaryotic cell", russian: "эукариотическая клетка" } },
+    { word: "תא פרוקריוטי", translation: { portuguese: "célula procariótica", english: "prokaryotic cell", russian: "прокариотическая клетка" } },
+    { word: "מיטוכונדריה", translation: { portuguese: "mitocôndria", english: "mitochondria", russian: "митохондрия" } },
+    { word: "ריבוזום", translation: { portuguese: "ribossomo", english: "ribosome", russian: "рибосома" } },
+    { word: "כלורופלסט", translation: { portuguese: "cloroplasto", english: "chloroplast", russian: "хлоропласт" } },
+    { word: "דופן תא", translation: { portuguese: "parede celular", english: "cell wall", russian: "клеточная стенка" } },
+    { word: "גרעין התא", translation: { portuguese: "núcleo celular", english: "cell nucleus", russian: "клеточное ядро" } },
+    { word: "מערכת הובלה", translation: { portuguese: "sistema de transporte", english: "transport system", russian: "транспортная система" } },
+    { word: "אנזים", translation: { portuguese: "enzima", english: "enzyme", russian: "фермент" } },
+    { word: "קטליזה", translation: { portuguese: "catálise", english: "catalysis", russian: "катализ" } },
+    { word: "פוטוסינתזה", translation: { portuguese: "fotossíntese", english: "photosynthesis", russian: "фотосинтез" } },
+    { word: "נשימה תאית", translation: { portuguese: "respiração celular", english: "cellular respiration", russian: "клеточное дыхание" } },
+    { word: "אברונים", translation: { portuguese: "organelas", english: "organelles", russian: "органеллы" } },
+    { word: "חלוקת תאים", translation: { portuguese: "divisão celular", english: "cell division", russian: "деление клеток" } },
+    { word: "מיטוזה", translation: { portuguese: "mitose", english: "mitosis", russian: "митоз" } },
+    { word: "מיוזה", translation: { portuguese: "meiose", english: "meiosis", russian: "мейоз" } },
+    { word: "כרומוזום", translation: { portuguese: "cromossomo", english: "chromosome", russian: "хромосома" } },
+    { word: "כרומטידה", translation: { portuguese: "cromátide", english: "chromatid", russian: "хроматида" } },
+    { word: "גן", translation: { portuguese: "gene", english: "gene", russian: "ген" } },
+    { word: "אלל", translation: { portuguese: "alelo", english: "allele", russian: "аллель" } },
+    { word: "תכונה תורשתית", translation: { portuguese: "característica hereditária", english: "hereditary trait", russian: "наследуемый признак" } },
+    { word: "רבייה", translation: { portuguese: "reprodução", english: "reproduction", russian: "размножение" } },
+    { word: "אורגניזם", translation: { portuguese: "organismo", english: "organism", russian: "организм" } },
+    { word: "רב-תאיים", translation: { portuguese: "multicelulares", english: "multicellular", russian: "многоклеточные" } },
+    { word: "חד-תאיים", translation: { portuguese: "unicelulares", english: "unicellular", russian: "одноклеточные" } },
+    { word: "התאמה לסביבה", translation: { portuguese: "adaptação ao ambiente", english: "adaptation to the environment", russian: "адаптация к среде" } },
   ],
-  "11": [  // Grade 11
-    { word: "חומר", translation: { hebrew: "חומר", english: "matter", russian: "вещество", portuguese: "matéria" } },
-    { word: "ממברנה", translation: { hebrew: "ממברנה", english: "membrane", russian: "мембрана", portuguese: "membrana" } },
-    { word: "חלבון", translation: { hebrew: "חלבון", english: "protein", russian: "белок", portuguese: "proteína" } },
-    { word: "פחמימה", translation: { hebrew: "פחמימה", english: "carbohydrate", russian: "углевод", portuguese: "carboidrato" } },
+  "11": [
+    { word: "דנ״א דו-גדילי", translation: { portuguese: "DNA de fita dupla", english: "double-stranded DNA", russian: "двуцепочечная ДНК" } },
+    { word: "קודון", translation: { portuguese: "códon", english: "codon", russian: "кодон" } },
+    { word: "אנטיקודון", translation: { portuguese: "anticódon", english: "anticodon", russian: "антикодон" } },
+    { word: "שחבור", translation: { portuguese: "splicing", english: "splicing", russian: "сплайсинг" } },
+    { word: "אינטרון", translation: { portuguese: "íntron", english: "intron", russian: "интрон" } },
+    { word: "אקסון", translation: { portuguese: "éxon", english: "exon", russian: "экзон" } },
+    { word: "פולימראז", translation: { portuguese: "polimerase", english: "polymerase", russian: "полимераза" } },
+    { word: "RNA פולימראז", translation: { portuguese: "RNA polimerase", english: "RNA polymerase", russian: "РНК-полимераза" } },
+    { word: "דנ״א פולימראז", translation: { portuguese: "DNA polimerase", english: "DNA polymerase", russian: "ДНК-полимераза" } },
+    { word: "פרימאז", translation: { portuguese: "primase", english: "primase", russian: "примаза" } },
+    { word: "הליקאז", translation: { portuguese: "helicase", english: "helicase", russian: "хеликаза" } },
+    { word: "ליגאז", translation: { portuguese: "ligase", english: "ligase", russian: "лигаза" } },
+    { word: "שכפול חצי שמרני", translation: { portuguese: "replicação semiconservativa", english: "semiconservative replication", russian: "полуконсервативная репликация" } },
+    { word: "טלומר", translation: { portuguese: "telômero", english: "telomere", russian: "теломер" } },
+    { word: "טלומראז", translation: { portuguese: "telomerase", english: "telomerase", russian: "теломераза" } },
+    { word: "מוטציות שקטות", translation: { portuguese: "mutações silenciosas", english: "silent mutations", russian: "молчащие мутации" } },
+    { word: "מוטציות שינוי מסגרת קריאה", translation: { portuguese: "mutações de mudança de quadro", english: "frameshift mutations", russian: "мутации сдвига рамки считывания" } },
+    { word: "מוטציות חסר", translation: { portuguese: "deleção", english: "deletion", russian: "делеция" } },
+    { word: "מוטציות תוספת", translation: { portuguese: "inserção", english: "insertion", russian: "инсерция" } },
+    { word: "מוטציות החלפה", translation: { portuguese: "substituição", english: "substitution", russian: "замена" } },
+    { word: "קריוטיפ", translation: { portuguese: "cariograma", english: "karyotype", russian: "кариотип" } },
+    { word: "טרנספוזון", translation: { portuguese: "transposão", english: "transposon", russian: "транспозон" } },
+    { word: "השפעה פליאוטרופית", translation: { portuguese: "efeito pleiotrópico", english: "pleiotropic effect", russian: "плейотропный эффект" } },
+    { word: "חדירות גן", translation: { portuguese: "penetrância", english: "penetrance", russian: "проникаемость" } },
+    { word: "שונות גנטית", translation: { portuguese: "variação genética", english: "genetic variation", russian: "генетическая вариация" } },
+    { word: "שיבוט", translation: { portuguese: "clonagem", english: "cloning", russian: "клонирование" } },
+    { word: "שחזור", translation: { portuguese: "engenharia de DNA", english: "DNA engineering", russian: "инженерия ДНК" } },
+    { word: "ריצוף דנ״א", translation: { portuguese: "sequenciamento de DNA", english: "DNA sequencing", russian: "секвенирование ДНК" } },
+    { word: "אלקטרופורזה בג'ל", translation: { portuguese: "eletroforese em gel", english: "gel electrophoresis", russian: "гелевая электрофорез" } },
+    { word: "אנזימי הגבלה", translation: { portuguese: "enzimas de restrição", english: "restriction enzymes", russian: "рестриктазы" } },
+    { word: "פלסמיד", translation: { portuguese: "plasmídeo", english: "plasmid", russian: "плазмида" } },
+    { word: "טרנספורמציה", translation: { portuguese: "transformação", english: "transformation", russian: "трансформация" } },
+    { word: "פרומוטר", translation: { portuguese: "promotor", english: "promoter", russian: "промотор" } },
+    { word: "רגולטור", translation: { portuguese: "regulador", english: "regulator", russian: "регулятор" } },
+    { word: "אופרון", translation: { portuguese: "operon", english: "operon", russian: "оперон" } },
+    { word: "אופרון הלקטוז", translation: { portuguese: "operon da lactose", english: "lactose operon", russian: "оперон лактозы" } },
+    { word: "דגם זיקת התאמה", translation: { portuguese: "modelo chave-fechadura", english: "lock-and-key model", russian: "модель замок-ключ" } },
+    { word: "בקרה גנטית", translation: { portuguese: "regulação genética", english: "genetic regulation", russian: "генетическая регуляция" } },
+    { word: "בקרת שעתוק", translation: { portuguese: "controle da transcrição", english: "transcriptional control", russian: "контроль транскрипции" } },
+    { word: "בקרת תרגום", translation: { portuguese: "controle da tradução", english: "translational control", russian: "контроль трансляции" } },
+    { word: "בקרת ביטוי גנים", translation: { portuguese: "controle da expressão gênica", english: "gene expression control", russian: "регуляция экспрессии генов" } },
+    { word: "גורמי שעתוק", translation: { portuguese: "fatores de transcrição", english: "transcription factors", russian: "факторы транскрипции" } },
+    { word: "אפיגנטיקה", translation: { portuguese: "epigenética", english: "epigenetics", russian: "эпигенетика" } },
+    { word: "מתילציה של דנ״א", translation: { portuguese: "metilação do DNA", english: "DNA methylation", russian: "метилирование ДНК" } },
+    { word: "אצטילציה של היסטונים", translation: { portuguese: "acetilação de histonas", english: "histone acetylation", russian: "ацетилирование гистонов" } },
+    { word: "דה-מתילציה", translation: { portuguese: "desmetilação", english: "demethylation", russian: "деметилирование" } },
+    { word: "גנום", translation: { portuguese: "genoma", english: "genome", russian: "геном" } },
+    { word: "פרויקט גנום האנושי", translation: { portuguese: "Projeto Genoma Humano", english: "Human Genome Project", russian: "Проект «Геном человека»" } },
+    { word: "רצפים חוזרניים", translation: { portuguese: "sequências repetitivas", english: "repetitive sequences", russian: "повторяющиеся последовательности" } },
+    { word: "רצפים רגולטוריים", translation: { portuguese: "sequências reguladoras", english: "regulatory sequences", russian: "регуляторные последовательности" } },
+    { word: "הנדסה גנטית", translation: { portuguese: "engenharia genética", english: "genetic engineering", russian: "генетическая инженерия" } },
+    { word: "אורגניזם מהונדס גנטית", translation: { portuguese: "OGM", english: "genetically modified organism", russian: "генетически модифицированный организм" } },
+    { word: "שיבוט מולקולרי", translation: { portuguese: "clonagem molecular", english: "molecular cloning", russian: "молекулярное клонирование" } },
+    { word: "ביוטכנולוגיה חקלאית", translation: { portuguese: "biotecnologia agrícola", english: "agricultural biotechnology", russian: "агробиотехнология" } },
+    { word: "ביוטכנולוגיה רפואית", translation: { portuguese: "biotecnologia médica", english: "medical biotechnology", russian: "медицинская биотехнология" } },
+    { word: "תרפיה גנטית", translation: { portuguese: "terapia genética", english: "gene therapy", russian: "генная терапия" } },
   ],
-  "12": [  // Grade 12
-    { word: "גֵן", translation: { hebrew: "גֵן", english: "gene", russian: "ген", portuguese: "gene" } },
-    { word: "דנ״א", translation: { hebrew: "דנ״א", english: "DNA", russian: "ДНК", portuguese: "DNA" } },
-    { word: "אנזים", translation: { hebrew: "אנזים", english: "enzyme", russian: "фермент", portuguese: "enzima" } },
-    { word: "כרומוזום", translation: { hebrew: "כרומוזום", english: "chromosome", russian: "хромосома", portuguese: "cromossomo" } },
+  "12": [
+    { word: "דנ״א דו-גדילי", translation: { portuguese: "DNA de fita dupla", english: "double-stranded DNA", russian: "двуцепочечная ДНК" } },
+    { word: "קודון", translation: { portuguese: "códon", english: "codon", russian: "кодон" } },
+    { word: "אנטיקודון", translation: { portuguese: "anticódon", english: "anticodon", russian: "антикодон" } },
+    { word: "שחבור", translation: { portuguese: "splicing", english: "splicing", russian: "сплайсинг" } },
+    { word: "אינטרון", translation: { portuguese: "íntron", english: "intron", russian: "интрон" } },
+    { word: "אקסון", translation: { portuguese: "éxon", english: "exon", russian: "экзон" } },
+    { word: "פולימראז", translation: { portuguese: "polimerase", english: "polymerase", russian: "полимераза" } },
+    { word: "RNA פולימראז", translation: { portuguese: "RNA polimerase", english: "RNA polymerase", russian: "РНК-полимераза" } },
+    { word: "דנ״א פולימראז", translation: { portuguese: "DNA polimerase", english: "DNA polymerase", russian: "ДНК-полимераза" } },
+    { word: "פרימאז", translation: { portuguese: "primase", english: "primase", russian: "примаза" } },
+    { word: "הליקאז", translation: { portuguese: "helicase", english: "helicase", russian: "хеликаза" } },
+    { word: "ליגאז", translation: { portuguese: "ligase", english: "ligase", russian: "лигаза" } },
+    { word: "שכפול חצי שמרני", translation: { portuguese: "replicação semiconservativa", english: "semiconservative replication", russian: "полуконсервативная репликация" } },
+    { word: "טלומר", translation: { portuguese: "telômero", english: "telomere", russian: "теломер" } },
+    { word: "טלומראז", translation: { portuguese: "telomerase", english: "telomerase", russian: "теломераза" } },
+    { word: "מוטציות שקטות", translation: { portuguese: "mutações silenciosas", english: "silent mutations", russian: "молчащие мутации" } },
+    { word: "מוטציות שינוי מסגרת קריאה", translation: { portuguese: "mutações de mudança de quadro", english: "frameshift mutations", russian: "мутации сдвига рамки считывания" } },
+    { word: "מוטציות חסר", translation: { portuguese: "deleção", english: "deletion", russian: "делеция" } },
+    { word: "מוטציות תוספת", translation: { portuguese: "inserção", english: "insertion", russian: "инсерция" } },
+    { word: "מוטציות החלפה", translation: { portuguese: "substituição", english: "substitution", russian: "замена" } },
+    { word: "קריוטיפ", translation: { portuguese: "cariograma", english: "karyotype", russian: "кариотип" } },
+    { word: "טרנספוזון", translation: { portuguese: "transposão", english: "transposon", russian: "транспозон" } },
+    { word: "השפעה פליאוטרופית", translation: { portuguese: "efeito pleiotrópico", english: "pleiotropic effect", russian: "плейотропный эффект" } },
+    { word: "חדירות גן", translation: { portuguese: "penetrância", english: "penetrance", russian: "проникаемость" } },
+    { word: "שונות גנטית", translation: { portuguese: "variação genética", english: "genetic variation", russian: "генетическая вариация" } },
+    { word: "שיבוט", translation: { portuguese: "clonagem", english: "cloning", russian: "клонирование" } },
+    { word: "שחזור", translation: { portuguese: "engenharia de DNA", english: "DNA engineering", russian: "инженерия ДНК" } },
+    { word: "ריצוף דנ״א", translation: { portuguese: "sequenciamento de DNA", english: "DNA sequencing", russian: "секвенирование ДНК" } },
+    { word: "אלקטרופורזה בג'ל", translation: { portuguese: "eletroforese em gel", english: "gel electrophoresis", russian: "гелевая электрофорез" } },
+    { word: "אנזימי הגבלה", translation: { portuguese: "enzimas de restrição", english: "restriction enzymes", russian: "рестриктазы" } },
+    { word: "פלסמיד", translation: { portuguese: "plasmídeo", english: "plasmid", russian: "плазмида" } },
+    { word: "טרנספורמציה", translation: { portuguese: "transformação", english: "transformation", russian: "трансформация" } },
+    { word: "פרומוטר", translation: { portuguese: "promotor", english: "promoter", russian: "промотор" } },
+    { word: "רגולטור", translation: { portuguese: "regulador", english: "regulator", russian: "регулятор" } },
+    { word: "אופרון", translation: { portuguese: "operon", english: "operon", russian: "оперон" } },
+    { word: "אופרון הלקטוז", translation: { portuguese: "operon da lactose", english: "lactose operon", russian: "оперон лактозы" } },
+    { word: "דגם זיקת התאמה", translation: { portuguese: "modelo chave-fechadura", english: "lock-and-key model", russian: "модель замок-ключ" } },
+    { word: "בקרה גנטית", translation: { portuguese: "regulação genética", english: "genetic regulation", russian: "генетическая регуляция" } },
+    { word: "בקרת שעתוק", translation: { portuguese: "controle da transcrição", english: "transcriptional control", russian: "контроль транскрипции" } },
+    { word: "בקרת תרגום", translation: { portuguese: "controle da tradução", english: "translational control", russian: "контроль трансляции" } },
+    { word: "בקרת ביטוי גנים", translation: { portuguese: "controle da expressão gênica", english: "gene expression control", russian: "регуляция экспрессии генов" } },
+    { word: "גורמי שעתוק", translation: { portuguese: "fatores de transcrição", english: "transcription factors", russian: "факторы транскрипции" } },
+    { word: "אפיגנטיקה", translation: { portuguese: "epigenética", english: "epigenetics", russian: "эпигенетика" } },
+    { word: "מתילציה של דנ״א", translation: { portuguese: "metilação do DNA", english: "DNA methylation", russian: "метилирование ДНК" } },
+    { word: "אצטילציה של היסטונים", translation: { portuguese: "acetilação de histonas", english: "histone acetylation", russian: "ацетилирование гистонов" } },
+    { word: "דה-מתילציה", translation: { portuguese: "desmetilação", english: "demethylation", russian: "деметилирование" } },
+    { word: "גנום", translation: { portuguese: "genoma", english: "genome", russian: "геном" } },
+    { word: "פרויקט גנום האנושי", translation: { portuguese: "Projeto Genoma Humano", english: "Human Genome Project", russian: "Проект «Геном человека»" } },
+    { word: "רצפים חוזרניים", translation: { portuguese: "sequências repetitivas", english: "repetitive sequences", russian: "повторяющиеся последовательности" } },
+    { word: "רצפים רגולטוריים", translation: { portuguese: "sequências reguladoras", english: "regulatory sequences", russian: "регуляторные последовательности" } },
+    { word: "הנדסה גנטית", translation: { portuguese: "engenharia genética", english: "genetic engineering", russian: "генетическая инженерия" } },
+    { word: "אורגניזם מהונדס גנטית", translation: { portuguese: "OGM", english: "genetically modified organism", russian: "генетически модифицированный организм" } },
+    { word: "שיבוט מולקולרי", translation: { portuguese: "clonagem molecular", english: "molecular cloning", russian: "молекулярное клонирование" } },
+    { word: "ביוטכנולוגיה חקלאית", translation: { portuguese: "biotecnologia agrícola", english: "agricultural biotechnology", russian: "агробиотехнология" } },
+    { word: "ביוטכנולוגיה רפואית", translation: { portuguese: "biotecnologia médica", english: "medical biotechnology", russian: "медицинская биотехнология" } },
+    { word: "תרפיה גנטית", translation: { portuguese: "terapia genética", english: "gene therapy", russian: "генная терапия" } },
   ],
-};
+};
\ No newline at end of file