Vital Functions--all vertebrates

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Across
  1. 3. lay eggs that are leathery
  2. 6. lay eggs without shells
  3. 8. These invertebrates have hair for protection.
  4. 11. fins that work together as sets
  5. 12. Amphibian eggs hatch into _____.
  6. 13. Two wings are used for this.
  7. 15. Some reptiles _____ eggs in sand.
  8. 16. Birds and mammals have hearts with this many chambers.
  9. 17. _____ have internal skeletons for support.
  10. 19. Fish have hearts with this many chambers.
Down
  1. 1. Mammal eggs begin _____ the mother's body.
  2. 2. _____ allow fish to get oxygen from water.
  3. 4. Amphibians have slick, porous _____.
  4. 5. Two _____ are used for hopping or standing.
  5. 7. Scales can _____ for protection.
  6. 9. lay jelly-covered shells in water
  7. 10. Birds reproduce by means of eggs with _____ shells.
  8. 12. Reptiles have hearts with this many chambers.
  9. 14. how mammals feed their infants.
  10. 18. Fish have hearts with this many chambers.