vocabulary review

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Across
  1. 3. animals that crawl or creep walking
  2. 7. maybe, perhaps
  3. 8. happen or take place
  4. 10. to guess
  5. 12. animals that feed with their own milk
  6. 13. forebear (father’s father’s father’s..)
  7. 16. animals without backbones
  8. 17. to decide
  9. 20. some (accountable things)
Down
  1. 1. to success
  2. 2. no longer exist and will never again live on the earth.
  3. 4. Harden; convert it into stone
  4. 5. people who get in without permission
  5. 6. scientists who study fossils
  6. 9. wet, spongy land
  7. 11. animals that lives part of its live on land and part of its life in water.
  8. 14. animals with backbones
  9. 15. to maintain and reserve
  10. 18. bring in without permission, invitation, or welcome
  11. 19. not deep