evolution

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Across
  1. 3. theory that says once a species appears in the fossil record
  2. 4. organ no longer functional
  3. 9. organisms inherited from an ancestor
  4. 10. change in frequency
  5. 11. survival and/or reproduction
  6. 12. theory assuming that change comes gradually
  7. 13. natural and sexual selection
  8. 14. transfer of genetic material
  9. 15. how a new plant or animal is created
Down
  1. 1. have similar functions
  2. 2. a single phenotype is favored
  3. 5. traits are extremely favored
  4. 6. DNA
  5. 7. genetic diversity decreases
  6. 8. two or more species reciprocally