Across
- 2. The circulatory loop where deoxygenated blood from the heart flows to the lungs, oxygenates then flows back to the heart.
- 3. The number of chambers in a human heart
- 5. What snakes "pick up" when they flick their tongues.
- 7. An egg with a shell that contains food for the embryo and a mechanism for gas exchange and waste removal.
- 9. The process of exchanging oxygen for carbon dioxide in the tissues and carbon dioxide for oxygen in the lungs.
- 10. The type of endoskeleton that sharks have.
- 12. An animal that is not able to generate and maintain their own body heat.
- 15. The structural support system on the inside of an animal.
- 16. Where gas exchange occurs in fish.
Down
- 1. Only birds, mammals, and humans are this (it has to do with homeostasis).
- 4. Blood that has a low concentration of oxygen.
- 6. Vessels where the gas exchange occurs.
- 8. The skin of a shark has this instead of scales.
- 11. The vessel that carries blood away from the heart.
- 13. The number of chambers in a fish heart
- 14. The vessel that carries blood to the heart