Natural selection

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Across
  1. 3. the child of a human, animal, or plant
  2. 4. an animal being hunted and eaten by another animal
  3. 6. a variety
  4. 7. the process or act of trying to win analogous similar in function, but different origin
Down
  1. 1. theory that life forms came from simple ones
  2. 2. to have young or offspring
  3. 5. of or being a vestige, esp. an anatomical one