Billie Daniels

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Across
  1. 2. time that is approximate time
  2. 4. where Darwin went on his voyage.
  3. 6. /a characteristic belonging to someone
  4. 7. /changes must happen over __________ years.
  5. 8. / over the past 20,000 years,dogs have been ____ to produce different dog breeds.
  6. 12. /helps an organism survive and reproduce in its environment.
  7. 13. remain or imprints of a once-living organism
  8. 14. darwin studied their beaks
  9. 16. /states rock layers farther from the surface are younger.
  10. 17. /breeding with selective traits.
  11. 19. /time that determines the order or sequence of when events happened.
  12. 20. /natural selection is also about this.
Down
  1. 1. /change in genes.
  2. 3. / gradual change in traits by nature.
  3. 5. /all of the people born/living at the same time.
  4. 9. /darwin discovered this.
  5. 10. /a change or difference.
  6. 11. /passed down from generation to generation.
  7. 15. /the record of once-living organisms ______
  8. 18. /the deeper in the earths crust you find a fossil the ___ they are