Across
- 2. Birds that have powder down that repels water
- 4. Vertebrae that has dry skin, lungs, and eggs with several membranes
- 6. Structure to help birds digest food
- 10. Dorsal part of the shell
- 12. Only surviving member of the order Sphenodonta
- 14. Made of protein and develop from pits in birds’ skin
- 16. How Crocodiles do gas exchange
- 17. Animals that generate their own body heat
- 18. Excrete nitrogenous wastes in this form...
Down
- 1. Type of circulatory system reptiles have
- 3. Fierce carnivores that are part of the order Crocodilia
- 5. Muscular organ that helps breakdown food
- 7. rely on behavior to help control body temperature
- 8. Period 245 mya when reptiles roamed earth
- 9. ventral part of the shell
- 11. Where urine is produced
- 13. Egg named after the amnion, one of the four membranes
- 15. When a bird exhales air fills the...