Evolution

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Across
  1. 2. living features in an ecosystem
  2. 4. developed the theory of evolution
  3. 6. islands where variation in birds was observed
  4. 10. a population of one type of organism
  5. 13. a change in a species over a long time
  6. 15. the range of living things
  7. 16. one pathway for natural selection
  8. 17. a physical feature (type of adaptation)
  9. 18. Darwin studied these birds
  10. 19. how the body works to increase the chance of survival
  11. 20. mechanism by which evolution occurs
  12. 21. each member of a population does this
Down
  1. 1. nonliving features in an ecosystem
  2. 3. an important requirement for natural selection
  3. 5. came up with the same idea as Darwin
  4. 7. features that increase the chance of survival
  5. 8. action performed by an organism (type of adaptation)
  6. 9. one type of evolution
  7. 11. genetic mistakes that contribute to variation
  8. 12. an environmental factor that determines whether an organism lives or dies
  9. 14. this process produces genetic variation in sperm and ova