Across
- 3. makes it more fit for existence.
- 5. the genetic heritage passed down by our biological parents.
- 8. new types of creatures develop, and others disappear.
- 9. the study of heredity
- 10. of, relating to, or affecting structure
- 11. made the theory of evolution
Down
- 1. the act or fact of living or continuing longer than another person or thing.
- 2. the act, process, condition, or result of changing or varying
- 4. a mechanism of evolution.
- 6. a change in the DNA sequence of an organism.
- 7. involving, relating to, or emphasizing behavior.