Across
- 5. they eat only meat
- 7. its the act of exchanging oxygen and carbon dioxide
- 8. a system that helps you breathe
Down
- 1. it occurs in every cell in an animal
- 2. most of them trap and eat microscopic organisms
- 3. it has nine air sacs
- 4. an animal that eats plants
- 5. a cell that filters food
- 6. all of them have closed circulatory systems