Invertebrate Crossword

5. Spicules can be siliceous or (blank).
7. Horseshoe crabs are members of this class.
10. Annelids have radial and (blank) muscles.
11. A member of the type of Cnidarian body form that is primarily sessile.
12. Most animals are within this phylum.
15. The "bulbs" in the water vascular system along the radial canals.
16. The skeletal fibers of sponges are produced in these flagellated cells.
17. A member of the type of Cnidarian body form that is primarily motile.
19. Polychaetes have a linearly (blank) body, which is the main characteristic of annelids.
22. The flexible skeletal material in sponges.
23. Nematodes can be free-living or (blank).
24. A bivalve has two (blank).
25. Nematodes can enter the human body through bare feet because they often live in (blank).

1. The type of flagellated cell in a sponge that helps to pull water through the sponge.
2. A characteristic of Chordates beginning with the letter "P".
3. A octopus is in the class cephalopoda, and in the phylum (blank).
4. Snails are in this class.
6. Cnidaria contains this organism that is often mistaken for a plant or mineral structure.
8. The phylum of sea urchins is (blank).
9. The common name of an organism from the extinct subphylum of arthropoda is (blank).
13. Flatworms have (blank) symmetry.
14. The tapeworm that is commonly found in humans is from the phylum.
18. Cnidarians have many stinging capsules called (blank).
20. A phylum containing sessile organisms that always have radial symmetry.
21. Sponges have these hard skeletal fibers.