Across
- 3. the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock
- 6. the scientist that came up with the theory of evolution
- 7. a rock unit that is distinctive enough in appearance that a geologic mapper can tell it apart from the surrounding rock layers
Down
- 1. Variation in genetics, or alterations in the DNA
- 2. made up of all the fossils that have been found, along with their relative ages
- 4. a living life form
- 5. the study of how genes and traits are passed down from one generation to the next