natural selection

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Across
  1. 1. a scientist
  2. 3. a person or a child
  3. 5. a number of a organism
  4. 8. a gene
  5. 9. a organism eco
  6. 10. a rat is
Down
  1. 2. adapting
  2. 4. a characteristic
  3. 6. a hawk
  4. 7. a living thing