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Across
  1. 2. the offspring of many generations that have the same form of a trait.
  2. 4. a gap in the geologic record.
  3. 9. the passing of physical characteristics from parents to offspring.
  4. 10. 3 long periods of time
  5. 11. a characteristic
  6. 12. The preserved remains or traces of living things
  7. 13. a hollow area in sediment in the shape of an organism or part of an organism.
  8. 14. if it no longer exists and will never again live on Earth.
Down
  1. 1. subdivisions of eras
  2. 3. the change in living things over time.
  3. 5. a solid copy of the shape of an organism.
  4. 6. Scientists who study fossils
  5. 7. the scientific study of heredity
  6. 8. a ball of dust, gas, and ice that orbits the sun.
  7. 12. a break in the earth's crust