Across
- 5. traits that help organisms survive in a given environment
- 6. older layers of rock lie under younger rock layers
- 11. age of an object or event compared to another object or event
- 14. Earth's rigid outer shell
- 15. Selection, process of which organisms are best suited to a particular environment
- 16. organisms so similar that they are able to mate and produce fertile offspring
- 17. lithosphere broken up into sections
Down
- 1. body part that does not see to play a role in body functions
- 2. body parts that have similar function but not similar structure
- 3. Fossil, fossil of an organism that existed for a short period of time
- 4. actual age of a rock or fossil
- 7. body parts of different organisms that have similar structure but not similar function
- 8. long chains of underwater mountains
- 9. two oceanic plates move apart to form new oceanic crust
- 10. branch of life science that names and groups organisms
- 12. no more of a species living on Earth
- 13. cylinder of ice removed from an ice sheet
- 18. process by which species change over time