Across
- 1. water containing dissolved oxygen is drawn into the fish and passes over its _____.
- 4. ________ respiration needs oxygen for it to occur.
- 7. when you ________ your ribcage moves up and out.
- 8. older tadpoles and adults use their ______ and lungs.
- 10. all ________ exchange takes place in the lungs.
- 11. during the process of inhalation your ______ flattens.
- 12. the amount of oxygen needed to break down acid is called _______ debt.
Down
- 2. ________ acid is a poisonous chemical created by anaerobic respiration.
- 3. the _______ system is very important since it provides the body with oxygen.
- 5. amphibians such as toads and frogs have _______ respiratory surfaces.
- 6. plants use ______ energy than animals.
- 9. when you ________ your ribcage drops.