b28

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Across
  1. 4. Immune defense protein
  2. 5. Immune system trigger
  3. 8. Population support limit
  4. 10. Species variety
  5. 12. One benefits interaction
  6. 13. Feeding level
  7. 14. Community change over time
  8. 15. Ecological role
Down
  1. 1. Disease resistance
  2. 2. Both benefit interaction
  3. 3. One benefits neutral
  4. 6. Matter-recycling organism
  5. 7. Large ecosystem region
  6. 9. Degree of harmfulness
  7. 11. Disease-causing agent