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