Natural Selection

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Across
  1. 4. something that pollutes, esp. a waste substance that makes air, water, or land
  2. 6. a variety
  3. 8. an animal that hunts other animals for food
Down
  1. 1. to fill with more inhabitants than available resources can sustain
  2. 2. a way of hiding something by covering or coloring it
  3. 3. a natural process of evolution
  4. 5. to their environment survive and are able to reproduce, while those that are weak leave fewer or no offspring
  5. 7. or unhealthy; contaminant