Chapter 31

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