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