Across
- 2. dorsal part
- 5. air enters large posterior __________ in the body cavity
- 7. where the animal starts
- 9. help control body temperature
- 12. bag like structure
- 15. animals that can create there own body heat
- 17. named after the amnion
Down
- 1. on the wings of birds
- 3. fluid filled sac
- 4. ventral part
- 6. stores wast in the egg
- 8. rectangle shaped supports in feathers
- 10. structure in the bone
- 11. transport of oxygen
- 13. lower end of the esophagus
- 14. protects the animal tell it is ready to hatch
- 16. helps break down food