1. What is the largest planet in the solar system?

2. Which gas do humans need to breathe to survive?

3. Which animal is the fastest land mammal?

4. What is the hardest natural substance on Earth?

5. Which organ pumps blood around the human body?

6. Which planet is known as the Red Planet?

7. What is the largest species of shark?

8. What type of animal is a Komodo dragon?

9. What is the main gas found in Earth's atmosphere?

10. Which planet has the most moons?