biology

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Across
  1. 2. chemical and physical factors
  2. 3. down dead organic matter
  3. 5. look at cells
  4. 6. upon which an enzyme has its action
  5. 8. only on dead
  6. 10. cells working together
  7. 11. tissue working together
  8. 12. own food
  9. 16. hands
  10. 17. with a nucleus
  11. 18. for eye protection
  12. 19. cycle- converts nitrogen gas into unusable forms
  13. 20. with no nucleus
Down
  1. 1. organisms live
  2. 4. nutrients from others
  3. 7. preys on other organisms
  4. 9. hunt them
  5. 13. eats plants
  6. 14. organisms living and interacting in an environment
  7. 15. from spilled