Darwinian Evolution !

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Across
  1. 3. new alleles are created by genetic____
  2. 9. all living things are descended from this
  3. 11. the idea that one species can turn into a new species
  4. 13. more individuals than the environment can handle
  5. 15. the study of geographic distribution of organisms
  6. 16. preserved remains of organisms
  7. 18. breeding for certain desirable traits
  8. 19. the change of a species over time
Down
  1. 1. when nature chooses certain traits
  2. 2. the idea that a species changes over time
  3. 4. similar function different structure
  4. 5. evolution through inheritance of acquired traits
  5. 6. the ship darwin boarded during his trip
  6. 7. reason for why some individuals live longer and survive
  7. 8. ___structures are features that are similar in structure but have different functions.
  8. 10. number of principles in the theory of natural selection
  9. 12. a difference in a physical trait
  10. 14. a group of organisms that are so similar they can breed fertile offspring
  11. 16. when a species doesn't change they are___
  12. 17. difference between individuals in a population