Across
- 6. a branch of science where people select which organisms reproduce
- 8. the ancestor that related organisms decend from
- 11. branch of artificial selection where DNA is modified
- 13. structures left over from a common ancestor that are no longer used
- 14. a process which a species becomes better suited to its enviroment
- 15. animals no longer a living species
Down
- 1. physical traits the differ among one species
- 2. total of all the fossils collected
- 3. the numerical age of fossils
- 4. organization or timeline of the history of Earth based on major events like extinction
- 5. remains from animals living long ago
- 7. similar physical features in organisms that share a common ancestor
- 9. observable charactoristics resulting from genetics
- 10. geological age of fossils by comparing rock layers
- 12. the process which species adapt to their enviroments