Invertebrates

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Across
  1. 2. The first cycle of a cnidarian
  2. 3. A parasitic annelid found in a forest near you!
  3. 6. Sea stars do this
  4. 8. The main body mass of a mollusk
  5. 9. A type of respiration
  6. 10. Specialized cells that remove excess water
  7. 12. The defence of a sea anenome
  8. 16. Used for food processing
  9. 17. Spongebob's own phylum
  10. 18. A type of parasite found in phylum nematoda
  11. 19. Large phylum of segemented worms
  12. 21. Without coelom
Down
  1. 1. Sharp spikes located in the mesenchyme of a sponge
  2. 4. Complete and incomplete ___
  3. 5. One of the two special breathing organs found in a crustacean
  4. 7. Found in squid and octopi
  5. 11. Water passes through this opening into the vascular system
  6. 13. The outer skin layer of an arthropod
  7. 14. Unsegemented worms
  8. 15. Poisonous ammonia from cellular respiration is removed using tube-shaped organs called ___
  9. 16. The phylum for sea stars
  10. 17. Used for sucking in food in a platyhelminthe
  11. 20. Fluid filled cavity in the mesoderm of an invertebrate
  12. 22. The second phase of a cnidarian