Natural selection

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Across
  1. 1. an uncommon change in physical appearance of an animal or plant
  2. 5. develop gradually, especially from a simple to a more complex form.
  3. 6. develop gradually, especially from a simple to a more complex form.
  4. 7. the process whereby organisms better adapted to their environment tend to survive and produce more offspring
Down
  1. 2. The belief that species change over time
  2. 3. a different or distinct form or version of something.
  3. 4. or disguise the presence of (a person, animal, or object)
  4. 8. to receive something from your close relatives