Across
- 4. – Preserved remains or impression of an ancient organism
- 7. – Weather conditions in an area over a long time
- 10. – Type of selection that explains how traits spread
- 11. – The natural home of an organism
- 13. – When organisms fight for the same resources
- 14. – An animal that hunts and eats other animals
- 18. – The gradual change of species over time
- 19. – The end of a species, no individuals left alive
Down
- 1. – A trait that helps an organism survive in its environment
- 2. – Surroundings where organisms live
- 3. – A group of similar organisms that can reproduce
- 5. – Scientist who proposed the theory of natural selection
- 6. – The process where better-adapted organisms survive
- 8. – Variety of living things in an area
- 9. – Differences between individuals in a population
- 12. – An earlier type of organism from which others evolved
- 15. – To make offspring
- 16. – A change in DNA that can lead to variation
- 17. – Study of Earth's physical structure (helps explain fossil layers)