Across
- 2. internal network of tubes in insects
- 5. single-celled organisms are _______
- 6. gases enter and leave the tracheae through__
- 10. when too much water is lost fromt the surface
- 13. Insects live on land so they are..
- 15. small surface area to volume ratio to _____ water loss
- 16. the diffusion pathway needs to be _____
Down
- 1. the surface needs to be partially_____
- 3. water_____ off the body surface
- 4. This gas exchange system is very_____
- 7. the trachae divide into smaller tubes called
- 8. The taking in (and out) of air
- 9. the negative aspects of this system
- 11. Oxygen is absorbed by this process
- 12. respiratory gases move along a diffusion_____
- 14. The structures that support the tracheae