Natural Selection

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Across
  1. 3. any difference between members of the same species
  2. 5. a group of animals in the same species
  3. 6. preserved remains of a past organism
  4. 7. change over time
  5. 8. learned behavior or characteristic
Down
  1. 1. a well tested explanation for a result
  2. 2. the process where organisms best adapted survive
  3. 4. a group of similar organisms