Across
- 1. diffusion, undeveloped respiratory organs
- 4. developed respiratory organs
- 6. the basic structure of ______ is to ensure the exchange of respiratory gases
- 8. present in fish
- 10. type of respiration where is exchange of gases between environment and lungs
Down
- 2. present in insects
- 3. breathing is exchange of gases between organism and …?
- 5. present in molluscs
- 7. type of respiration where is exchange of gases between blood and cells
- 9. respiratory organs of terrestrial vertebrates