Evolution

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Across
  1. 4. that are similar in structure
  2. 5. that are similar in function
  3. 7. of evolution originating from a common ancestor
  4. 8. two species evolve together
  5. 12. that have no current function
  6. 14. of a new species
  7. 15. the theory of evolution by natural selection
  8. 16. different shaped beaks depending on the island they were from
  9. 17. to the variety of living things
  10. 18. of an organisms from millions of years ago
  11. 19. characteristic that helps an organism survive
  12. 20. organisms disappear from the earth
Down
  1. 1. two unrelated organisms look alike (porpoise and shark)
  2. 2. by which evolution occurs; natural
  3. 3. testable explanation
  4. 6. is the change in a over time
  5. 9. that Darwin visited
  6. 10. selection is also known as the survival of the
  7. 11. name of Darwin's book; the of species
  8. 13. study of the earth