Chapter 31

12345678910111213141516
Across
  1. 2. a bird's circulatory system has complete
  2. 5. What group became dominate about 215 mill years ago
  3. 7. food goes from the stomach/gizzard to the
  4. 10. snakes are what
  5. 11. dry scaly skin does not
  6. 12. it rely on behavior to help control body temp
  7. 15. medulla regulates
  8. 16. in feeding birds need a lot of
Down
  1. 1. what is the animal on the first page
  2. 3. and flight feathers are used for
  3. 4. food goes from the small intestine to the
  4. 6. birds regulate body temperature
  5. 7. scales can be rough or
  6. 8. reptiles live on
  7. 9. how many dinosaurs are on page 7
  8. 13. the discovery of the evolution of birds is
  9. 14. birds are believed to have evolved from