natural selection

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Across
  1. 3. his essay made Darwin understand evolution
  2. 6. could wipe out almost a whole local population
  3. 8. one of the factors that affect natural selection
  4. 9. Darwin identified_____ factors that affect natural selection
  5. 10. Darwin couldn't figure out evolution's_____
Down
  1. 1. Darwin studied them if they are produced by artificial selection
  2. 2. members of a_____differ from one another
  3. 4. species produce more____than can survive
  4. 5. Darwin bred them if they had fan-tails
  5. 7. the process of which individuals that are better adapt to their environment are most likely to survive