Chapter 31 Crossword

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Across
  1. 2. double loop system
  2. 5. allow one-way flow of air
  3. 6. contains yolk
  4. 9. Stores wastes
  5. 11. regulates the transport of oxygen
  6. 13. produces substances that are rich in fat
  7. 14. Type of fertilization
  8. 15. rely on behavior to help control body temp
  9. 16. Characteristics of reptiles
Down
  1. 1. helps mechanical breakdown
  2. 2. Birds can fly because of this
  3. 3. 1st chamber mixes acids and enzymes into food
  4. 4. feathers, wings, scaly legs, endotherm
  5. 7. egg amnion, chorion, yolk sac, allantois
  6. 8. carapace (dorsal) and plastron (ventral)
  7. 10. fluid-filled sac
  8. 12. contour and down