Across
- 3. The struggle among living things to get the necessities they need to survive
- 5. A process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same population
- 6. Sent Charles Darwin a letter in 1858
- 7. When there are too many fish and not enough oxygen
- 9. These organisms can only survive in water with dissolved oxygen
- 10. What Darwin bread with large fan-shaped tails
Down
- 1. The natural process by which something takes place
- 2. After he returned from England he was not satisfied with the theory of evolution
- 4. Darwin read an essay by this man to get a good understanding of how evolution works
- 8. Members of a population__________ in many of their traits