Evolution Crosswords Puzzle

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Across
  1. 2. to explain how
  2. 4. most adapted to
  3. 5. they want
  4. 7. survive and
  5. 11. that in layers of
  6. 16. choose which
  7. 19. rocks are found at the
  8. 21. solidified remains or imprints of once-living organisms.
  9. 23. Remnants of once-useful
Down
  1. 1. law of superposition
  2. 3. in its environment.
  3. 6. to breed to get the
  4. 8. that helps an
  5. 9. are solidified remains
  6. 10. are known as
  7. 12. and reproduce
  8. 13. are found at the top and
  9. 14. environment will
  10. 15. imprints of once-living
  11. 17. occurs
  12. 18. adaptation is a
  13. 20. rock, younger
  14. 22. structures.