Darwin's Theory

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Across
  1. 2. scientist who first presented the theory of natural selection and evolution
  2. 4. structure that remains from an ancestor that is no longer useful
  3. 7. structure that is similar between unrelated organisms due to a shared function
  4. 8. common _________; an organism from which different species are descended
  5. 9. structure that is similar among organisms due to a common ancestor
Down
  1. 1. a trait that makes an organisms better able to survive and reproduce
  2. 3. natural _______ favors organisms with advantageous traits
  3. 5. natural differences between members of a species
  4. 6. organisms must _______ for resources such as food and territory