Across
- 6. ship Darwin sailed on
- 9. Darwin studied
- 10. the struggle among living things
Down
- 1. species produce offspring
- 2. process which individuals are better adapted to their environment that should survive
- 3. father of evolution
- 4. differing in size, shape, and or color
- 5. when oxygen levels get low
- 7. classified life structure
- 8. an inherited trait