Across
- 5. A trait that helps an organism survive
- 6. Process which evolution occurs
- 7. When two unrelated species look a like
- 8. When new species form due to reproductive isolation
- 10. Species that are related share a common______
- 11. Proposed the theory of evolution through natural selection
- 12. When structures have no use in an organism
Down
- 1. Types of selection seen in dogs and other domesticated animals
- 2. When different species have similar structures
- 3. Diagrams that show evolutionary relationships
- 4. Birds studied by Darwin
- 9. The ability for an organism to survive in its environment