Invertebrates

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Across
  1. 3. opening and tentacles upward
  2. 4. regrowing lost body parts
  3. 7. collar cells
  4. 9. true body cavity
  5. 11. stinging cell
  6. 15. 2 sided
  7. 17. depends on host for food
  8. 20. detects changes in light and dark
  9. 21. formerly known as Coelenterata
  10. 23. support spike in sponges
  11. 26. living on land
  12. 29. inner tissue layer
  13. 31. middle tissue layer
  14. 32. waxy, non-cellular coating in roundworms
  15. 33. strains food from water
Down
  1. 1. Sponge phylum
  2. 2. outer tissue layer
  3. 5. flower-like cnidarian
  4. 6. 'seed' like reproductive structure in sponges
  5. 8. hollow ball of cells
  6. 10. Exit opening in sponges
  7. 12. "head" of a tapeworm
  8. 13. Roundworm phylum
  9. 14. flatworm phylum
  10. 15. growing a mini clone of the side
  11. 16. both sexes in one body
  12. 17. false body cavity
  13. 18. opening and tentacles downward
  14. 19. chemical sensors in Planaria
  15. 22. feeding cavity of Cnidarians
  16. 24. parasitic flatworm
  17. 25. freshwater flatworms
  18. 27. definite body form
  19. 28. tapeworm segment
  20. 30. symmetry like a wheel