Evolution

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Across
  1. 3. Early stage of development before birth or hatching.
  2. 6. Event causing the extinction of a large number of species within a relatively short period.
  3. 9. Method used to determine the absolute age of rocks and fossils.
  4. 11. A division of geologic time characterized by significant events.
  5. 12. Dating method that compares the ages of artifacts in relation to one another.
  6. 13. The process of gradual change over time.
  7. 14. The growth and development of an embryo.
Down
  1. 1. The process of reviving extinct species.
  2. 2. Shared evolutionary ancestor to which different species trace their descent.
  3. 4. The age of rocks and fossils in comparison to other rocks and fossils.
  4. 5. The structure of living organisms and their parts.
  5. 7. Fossil used to define and identify a particular time period.
  6. 8. Scientist who studies fossils to understand ancient life forms.
  7. 10. Collection of all known fossils, providing evidence of past life.