1. Which one of the following is a basic life support system?

2. Which one of the following is created by nature?

3. The domain of water is referred to

4. What do plant and animal kingdom make together?

5. Which one of the fallowing animals is called the ship of the desert?

6. When is the World Environment Day celebrated every year?

7. Who interact with the environment and modify it according to their needs?

8. Which one of the following is not a threat to environment?