Across
- 3. The scientific name for the human species.
- 5. Darwin's theory of evolution.
- 7. proposed the first theory of evolution.
- 9. ________ dating is where scientists age fossils based off how much radioactive elements are found in them.
- 11. Characteristics that help an organism survive.
- 12. a slow gradual change
- 14. ________ dating is where scientists age fossils based off how deep they can be found in the earth.
- 15. ________ evolution occurs between unrelated species.
- 16. Survival of the ________ describes hwo some variations make organisms better able to survive.
Down
- 1. When organisms evolve in response to each other.
- 2. Chance events that can affect the gene pool.
- 4. The islands Darwin sailed to.
- 6. ________ time scale is a record of Earth's history.
- 8. Differences among members of a species.
- 10. ________ evolution occurs between members of the same species.
- 13. The name of the ship Charles Darwin sailed on.