Biology Crossward Puzzle

1. A sponge cell that carries food particles to epidermal cells
6. The excurrent pore, the opening of a sponge's body that expels water
8. The process by which a small piece of a sponge can grow into a new, complete adult.
9. Phylum containing sponges.
12. A type of asexual reproduction in which portions from the parent form a new organism.
14. The openings through which water first enters a sponge.
17. A small freshwater cnidarian commonly found in quiet lakes or ponds.
19. The phylum that contains jellyfish.
20. The flattened structure at the lower end of certain cnidarians; used for attaching to objects and for locomotion.
22. Long, movable limbs used to catch prey.
23. A sponge's internal dormant cluster of cells encased in a tough spicule-reinforced covering.
24. The sponge's "skeleton."

2. The free-swimming, umbrella-shaped stage in the life cycle of cnidarians; reproduces sexually.
3. The osculum, the opening of a sponge's body that expels water.
4. A nervous system that lacks a brain and major ganglia.
5. A sessile, tubular cnidarian with a mouth and tentacles at one end and a basal disc at the other; reproduces asexually.
7. The internal cavity of cnidarians where digestion and food circulation occur.
10. Stinging cells containing nematocysts, used for defense.
11. The inner cellular layer of the digestive tract of cniidarians.
13. A stinging cell that contains poisonous barbs, coiled threads, or a sticky substance.
15. A loosely organized, mainly mesodermal embryonic tissue that develops into connective and skeletal tissues.
16. A flagellated cell that lines the inner cavity of a sponge.
18. A tissue that covers or lines a structure in animals.
21. The jellylike layer found between the ectoderm and the endoderm of the cnidarians.