Across
- 2. someone who studies the natural world
- 3. better suited traits survive
- 4. changes over successive generations
- 5. an organism's ability to survive and reproduce in its environment
- 7. group of volcanic islands in the Pacific Ocean
- 10. fundamental unit of heredity
- 11. system of ideas intended to explain something
- 12. prehistoric organism preserved in petrified form
Down
- 1. a change or difference
- 6. a distinguishing quality or characteristic
- 8. process of adapting
- 9. the scientific study of the Earth