Geologic Time and Evolution

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Across
  1. 1. The study of distribution of organisms around the world
  2. 4. The study of bodily structures
  3. 8. DNA sequence of genes
  4. 12. Smallest segment of geologic time
  5. 13. The oldest layer of sedimentary rock is at the base and the younger layers are at the top
  6. 14. Largest segment of geologic time
  7. 15. In descending order of duration (Eons, Eras, Epochs, and ages)
  8. 18. A fossil record of biological activity but not the preserved remains of a plant/animal
  9. 19. Know the order of events but not the dates
  10. 20. Fossils that are widespread but only exist for a short period of time
Down
  1. 2. The study of physical features of the earth and atmosphere
  2. 3. Several events in the Earth's past in which a large number of species became extinct
  3. 5. The earliest Eon of history
  4. 6. Traces of organisms of the past
  5. 7. During these spans of time specific systems of rocks were formed
  6. 9. The second longest portion of geologic time after an eon
  7. 10. Is a technique which is used to date materials such as rocks or carbon
  8. 11. Know the order of events and the dates
  9. 16. The study of the stage development
  10. 17. Change in the heritable characteristics of biological populations over successive generations