Across
- 4. The history of life in the geologic past as indicated by the traces or remains of living things.
- 6. The occurrence of hereditary or nonhereditary differences between individuals of a population.
- 7. The process by which individuals that are better adapted to their environment survive and reproduce more successfully than less well adapted individuals do.
- 9. A change in the nucleotide-base sequence of a gene or DNA molecule.
- 10. The trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock.
Down
- 1. The death of every member of a species.
- 2. The standard method used to divide Earth’s long natural history into manageable parts.
- 3. The human practice of breeding animals or plants that have certain desired traits.
- 5. The process in which inherited characteristics within a population change over generations such as new species sometime arise.
- 8. A characteristic that improves an individual’s ability to survive and reproduce in a particular environment.