Natural Selection & Evolution

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