Biology

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Across
  1. 3. theory that a species would slowly evolve over time through favorable mutations
  2. 4. same bone structure, same function, no common ancestor
  3. 5. both extremes are favored
  4. 8. theory that life comes from other life
  5. 11. person who theorized that evolution is due to natural selection
  6. 13. when two species evolve in response to each other
  7. 14. average trait is favored
  8. 15. theory that evolution occurs over a lifetime and changes with use/disuse
  9. 17. same bone structure, different functions, shows common ancestor
  10. 19. hypothesis that early rain and lightning created simple organic compounds to create life
  11. 20. person who created the theory of acquired characteristics
Down
  1. 1. show constant change in a species
  2. 2. period of no change followed by periods of rapid change
  3. 6. theory that life came from nothing
  4. 7. states that several key organelles of eukaryotes originated as symbiosis between organisms
  5. 9. one species can change over time to become two
  6. 10. one of the extreme traits is favored
  7. 12. adaptation that allows an animal to blend into its enviornment
  8. 16. our planet in its early years of volcanic activity
  9. 18. organ that is no longer in use