natural selection

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Across
  1. 3. to become bigger
  2. 5. present in or produced by nature
  3. 7. conditions and land that surrounds us
Down
  1. 1. thing of number of things that have been selected
  2. 2. slow process of changing to survive in an environment
  3. 4. to remain alive
  4. 6. to change with your environment
  5. 8. to undergo mutation