science

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