Across
- 3. Preserved evidence of an organism's activity
- 4. All the fossils ever discovered on Earth
- 9. Change over time
- 13. Lost its function
- 14. When one species resembles another
- 16. The study of species similarities
- 17. An inherited trait that increases survival
Down
- 1. Someone who studies plants and animals
- 2. Breeding organisms for desired traits
- 5. Similar function
- 6. A slight change in inherited traits
- 7. The ability to blend into the environment
- 8. Similar structure
- 10. When all the members of a species die out
- 11. A fossil copy of an organism in a rock
- 12. Divides Earth's history into eras
- 15. The Impression of an organism in a rock