Across
- 4. dating comparing the rock layers around it to determine the age of a fossil or rock
- 8. a feature in a species that has different versions
- 9. remains or impression of a prehistoric organism preserved in rock
- 10. segment of DNA that codes for something specific
- 11. a permanent change to a living things DNA
- 12. color of the eyes of the Southern Rock Hopper
- 14. the Galapagos Islands are about 600 miles off of the coast of this country
- 15. characteristic that helps an organism survive and reproduce in its environment
Down
- 1. amount of time it takes for half of the element or isotope to decay into the daughter element
- 2. different versions of a gene
- 3. bird that Charles Darwin noticed was different on different islands
- 4. dating using known rate of decay of certain elements to determine the approximate age of a rock or fossil
- 5. structures that remain on an organism, but have lost all or most of its original purpose
- 6. structures that can be compared across multiple species
- 7. different forms of a characteristic
- 13. may have a saddle shaped shell to be able to reach food