natural selection

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Across
  1. 2. a group of living organisms consisting of similar individuals capable of exchanging genes
  2. 4. selection organisms better adapted to their environment tend to survive
  3. 6. hide or disguise
  4. 7. difference in DNA among individuals or the differences between populations.
  5. 10. known for the theory of natural selection
  6. 12. carefully thought-out explanation for observations of the natural world
Down
  1. 1. he best-known early evolutionists. ...
  2. 3. develop gradually, from a simple to a more complex form.
  3. 5. to alter the genetic message carried by that gene
  4. 8. of Evolution process of change in all forms of life over generations
  5. 9. a change or adjustment to improve something
  6. 11. derive a quality, characteristic, or predisposition genetically