Evolution

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Across
  1. 4. a large group of humans
  2. 5. an object used for self protection
  3. 6. a period of time
  4. 7. someone who kills animals
Down
  1. 1. removal of impurities
  2. 2. used in firearms
  3. 3. alloy of iron and carbon
  4. 8. an object used to perform a certain task