Across
- 4. thousands of fish_____every fish kill
- 5. will be passed on for generations
- 6. Scientist that wrote and essay that inspired Darwin
- 7. Specific animal that Darwin bred
- 8. amount of times brown rats give birth a year
- 9. when the oxygen levels get too low in water
- 10. natural process when something takes place
Down
- 1. Theory that Darwin wrote
- 2. struggle among living things
- 3. individuals that are better adapted to their environment