ecology

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Across
  1. 3. omn
  2. 4. troph
  3. 5. pro
  4. 9. food
  5. 10. green
  6. 13. atmo
  7. 14. her
  8. 15. bio
  9. 16. con
  10. 17. carn
  11. 18. geo
Down
  1. 1. tropo
  2. 2. water
  3. 6. photo
  4. 7. meth
  5. 8. strato
  6. 11. carbon
  7. 12. hydro