Fossil/evolutionary

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Across
  1. 5. To change the frequencies of alleles in a population
  2. 7. The older fossils are deeper than younger
  3. 8. The sequence of changes among species
  4. 9. The formation of fossils as rock replaces tissue
  5. 10. The complete disappearance of a species
  6. 11. The order things occurred
  7. 12. The study of the structures of organisms and the parts
  8. 13. the remains of organisms and the layers they are found
Down
  1. 1. The rate of difference
  2. 2. Mineralized remains of animals or plants
  3. 3. Looking at chemicals to determine the age
  4. 4. When organisms are from a single ancestor
  5. 6. layers of rock that are deposited