Evolution Crosswords Puzzle

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