ecology

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Across
  1. 5. something relating to living organisms
  2. 6. interlocking food chains
  3. 8. the study of living things
  4. 9. gets something
  5. 10. makes something
  6. 12. things living in a certain area
  7. 13. living in a organism
  8. 15. neither organisms harm eachother
  9. 17. variation on earth
  10. 18. a place where someone or something lives in a group
Down
  1. 1. beginning of ecological systems
  2. 2. organisms in environment
  3. 3. more adapted in environment
  4. 4. used to identify organisms
  5. 7. secondary secession of a plants life
  6. 11. regions of the earth
  7. 14. physical not biological
  8. 16. symbiosis that helps both organisms