Darwin's Theory of Evolution

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Across
  1. 4. gas not found in the Earth's early atmosphere
  2. 6. the ability ot survive and reproduce successfully
  3. 7. molecule that marked the beginning of life
  4. 8. anexample of speciation (creation of new species in Galapagos
  5. 9. island that influenced Darwing
  6. 10. limited resources; one of four factors for natural selection
  7. 13. record of evolution
  8. 17. preserved remains of once living things
  9. 18. idea of why fossils have the same vones as living species
  10. 19. difference within a population; one of four factors of natural selection
  11. 20. this kind of reproduction increases variation;speeds the procees of evolution
  12. 21. had different shaped shells to suit their environment
  13. 23. similar structure in unreleated organism
  14. 25. one main difference between each Galapagos island
  15. 26. a well supported testable explanation of phenomena
  16. 27. increase genetic variation
  17. 28. proposed a mechanism for evolution
Down
  1. 1. structure that no longer serves a purpose
  2. 2. change of species over time
  3. 3. similarities in the ______ _____is another piece of evidence of evolution
  4. 5. Island with similar organisms have differetn traits to suit their environment
  5. 11. more offspring are produced than can survive;one of four factors for natural selection
  6. 12. structure that suggest common ancestry
  7. 14. name of the ship that Darwin sailed on
  8. 15. an organism can survive when it can do this
  9. 16. when the trees darkened the dark ones were the fittest
  10. 22. what Darwin said why organisms evolve
  11. 24. evidence showing similarity in early stages;one of four factors for natural selection
  12. 26. a specific characteristic