Across
- 1. a ____ is any preserved evidence of an organism
- 3. major evidence of rock layers matching
- 6. is the idea that life arises from non-life
- 8. a group of individuals of the same species that can interbreed
- 9. trait controlled by 2 or more genes
- 10. type of selection where one end of bell curve has higher fitness
Down
- 2. earth formed with no ____
- 4. these cells formed 1.8 billion years ago
- 5. dating method that used the decay of radioactive isotopes to measure the age of rock
- 7. is any change in the relative frequency of alleles in a population