4

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Across
  1. 4. fungi
  2. 7. cultural
  3. 9. label (chemical)
  4. 12. abiotic
  5. 13. biological
  6. 14. piercing
  7. 19. vertebrate
  8. 20. disorder
Down
  1. 1. chemical
  2. 2. physical
  3. 3. virus
  4. 5. quarantine
  5. 6. bacteria
  6. 8. rasping
  7. 10. incomplete (metamorphosis)
  8. 11. pathogen
  9. 15. chewing
  10. 16. arthropod
  11. 17. parasite
  12. 18. pesticide