b32

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Across
  1. 1. Spiny-skinned animal
  2. 4. Soft-bodied animal
  3. 7. Toxin concentration increase
  4. 8. Egg membrane vertebrate
  5. 10. Flatworm phylum
  6. 12. Stinging-cell animal
  7. 14. Spinal cord animal
  8. 15. Critical ecosystem species
Down
  1. 2. Nutrient water pollution
  2. 3. Roundworm phylum
  3. 5. Community replacement
  4. 6. Environmental health species
  5. 9. Fish gill cover
  6. 11. Segmented worm
  7. 13. Jointed-leg invertebrate