Across
- 2. What happens when there is too much offspring.
- 4. Darwin studied this bird.
- 7. What happens when there is less oxygen in the water.
- 9. Individuals with this can survive and reproduce.
- 10. What is the struggle among living things called?
Down
- 1. When a change in this happens organisms may die.
- 3. What do scientists perform to answer a question?
- 5. The natural process by which something takes place.
- 6. What is Darwin called?
- 8. Who did Darwin get his idea of evolution from?