ecology

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Across
  1. 7. clue
  2. 10. derives the organic compounds
  3. 11. a biological community
  4. 12. occupied by living organisms.
  5. 14. the branch of biology
  6. 15. key for the identification
  7. 18. clue
  8. 19. infestation by a parasite.
  9. 20. resulting from living things
  10. 21. adapted to their environment
Down
  1. 1. clue
  2. 2. devoid of life; sterile
  3. 3. habitat after a major
  4. 4. action of populating an area.
  5. 5. produces organic compounds
  6. 6. interdependent food chains
  7. 8. ecological succession
  8. 9. association between two
  9. 13. living in the same place
  10. 16. both organisms involved.
  11. 17. clue