Across
- 1. struggle to get necessities
- 3. wrote an essay that helped darwin understand evolution
- 4. father of evolution
- 6. diversity of animals that darwin studied
- 9. bred on purpose for desired traits
Down
- 2. darwin's theory
- 5. birds darwin bred/studied
- 7. what kind of characteristic helps animals survive
- 8. natural process by which something takes place
- 9. also read Malthus' work