1. What is the amount of oxygen in the air we breathe out?

2. What is the windpipe scientifically known as?

3. Through which organ does an earthworm breathe?

4. Which organ do fish use for breathing?

5. What do insects use for breathing?

6. What helps frogs breathe underwater?

7. What do frogs use for breathing on land?

8. Through what does gas exchange occur in plants?

9. Which part prevents food from entering the windpipe while swallowing?

10. Which body cavity contains the lungs?