Earth's History

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Across
  1. 1. different structures with similar function
  2. 5. variation among organisms
  3. 9. similar environment and look but no common ancestor
  4. 12. common ancestor but evolved into different species
  5. 14. tells us the youngest layer is near the top
  6. 16. the type of rock to contain fossils
  7. 17. map of shared traits and ancestral relationships
  8. 18. same structures
Down
  1. 2. the rock layer on the bottom
  2. 3. collection of all fossils and their location
  3. 4. record of Earth's History
  4. 6. the rock layer on the top
  5. 7. as you move up the geologic time scale organism become more of this
  6. 8. least similar to today's organisms
  7. 10. sudden disappearance of many species
  8. 11. most similar to today's organisms
  9. 13. the preserved remains of an organism
  10. 15. a species that is no longer living