Natural Selection

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Across
  1. 2. First there must be..
  2. 4. A _______ is the natural process by witch something takes place
  3. 7. What did animals did Darwin study
  4. 9. What animal can wipe out most if the population
  5. 10. Darwin was not satisfied with his theory when he returned to?
Down
  1. 1. Darwin proposed that over a long time natural selection can what?
  2. 3. The struggle among living things to get necessary amount of food water and shelter is?
  3. 5. Who understood that evolution would work
  4. 6. Darwin waited a long time to publish his what
  5. 8. What animal could be in danger if it was living in a small body of water