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