Biology Crossword Puzzle

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Across
  1. 4. non-living
  2. 6. population of average traits
  3. 8. difference in cells
  4. 10. living
  5. 11. reproductive success
  6. 13. make own food
  7. 14. gradual variation
  8. 15. important species
Down
  1. 1. one species is harmed
  2. 2. eat food
  3. 3. one species is unaffected
  4. 5. both species benefit
  5. 7. variety of life
  6. 9. one side of population reproduces
  7. 12. change in the DNA sequence