Across
- 2. How well an organism can survive within an environment
- 4. Struggle between living things for resources
- 5. When a species no longer exists
- 7. Process by which something takes place
- 9. Process by which modern organisms have descended from ancient organisms
- 10. Islands off the coast of Ecuador where Darwin studied birds
Down
- 1. Inherited trait or behavior that helps an organism survive
- 3. Group of similar organisms that can produce fertile offspring
- 6. Young organism that develops from a fertilized egg
- 8. Preserved remains of an organism that lived in the past