Natural selection

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Across
  1. 2. - the name of Darwin's book; the of species
  2. 5. - process by which evolution occurs natural
  3. 6. - pattern of evolution where a species is stable for a long time then rapidly changes equilibrium
  4. 7. - when two unrelated organisms look alike (sharks & dolphins)
  5. 8. - formation of new species
  6. 9. - natural selection is also known as the survival of the
  7. 11. - preserved remains of ancient organisms
  8. 12. - structures that are similar
  9. 13. - structures that have no current function
  10. 19. - principle that states that living species are descended from ancient ones descent with
  11. 20. - the name of the ship that darwin traveled on
  12. 21. - when organisms disappear from the earth
  13. 23. - the study of the earth
Down
  1. 1. - had different shaped beaks depending on the island they were from
  2. 3. - a characteristic that helps an organism survive
  3. 4. - proposed the theory of evolution by natural selection
  4. 7. - when two species evolve together
  5. 10. - had different shaped shells depending on the island they were from
  6. 14. - change over time
  7. 15. - islands that Darwin visited
  8. 16. - refers to the variety of living things
  9. 17. - when one species evolves into many adaptive
  10. 18. - well-supported testable explanation
  11. 22. - required for new species to form