Natural Selection

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Across
  1. 2. proposed the theory of evolution by natural selection
  2. 3. variety of living things
  3. 5. change over time
  4. 7. required for a new species to form
  5. 9. structures that are similar
  6. 10. preserved remains of ancient organisms
Down
  1. 1. had different shaped beaks depending on the island that they are from
  2. 4. formation of new species
  3. 6. the ship which Darwin traveled on
  4. 8. a characteristic that helps the organism to survive