Biology

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Across
  1. 4. group of organisms
  2. 5. acts as fuel
  3. 6. arranged in an orderly way
  4. 9. natural changes that occur during life
  5. 10. individual life form
  6. 13. inherited characteristic
Down
  1. 1. reaction to a stimulus
  2. 2. study of living organisms
  3. 3. conditions in which living things operate
  4. 7. production of offspring
  5. 8. internal conditions to maintain life
  6. 11. addition of mass to an organism
  7. 12. event that evokes a specific function in an organ or tissue