Chapter 31

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Across
  1. 1. birds regulate body temperature
  2. 4. food goes from the stomach/gizzard to the
  3. 6. a bird's circulatory system has complete
  4. 9. medulla regulates
  5. 10. what is the animal on the first page
  6. 14. food goes from the small intestine to the
  7. 15. how many dinosaurs are on page 7
  8. 17. it rely on behavior to help control body temp
Down
  1. 2. birds are believed to have evolved from
  2. 3. the discovery of the evolution of birds is
  3. 5. dry scaly skin does not
  4. 7. What group became dominate about 215 mill years ago
  5. 8. scales can be rough or
  6. 11. in feeding birds need a lot of
  7. 12. reptiles live on
  8. 13. and flight feathers are used for
  9. 16. snakes are what