Biology Crossward Puzzle

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Across
  1. 2. A sponge's internal dormant cluster of cells encased in a tough spicule-reinforced covering.
  2. 10. The openings through which water first enters a sponge.
  3. 14. The process by which a small piece of a sponge can grow into a new, complete adult.
  4. 15. A type of asexual reproduction in which portions from the parent form a new organism.
  5. 16. A flagellated cell that lines the inner cavity of a sponge.
  6. 17. A sponge cell that carries food particles to epidermal cells
  7. 19. The phylum that contains jellyfish.
  8. 20. Phylum containing sponges.
  9. 22. The flattened structure at the lower end of certain cnidarians; used for attaching to objects and for locomotion.
  10. 23. A nervous system that lacks a brain and major ganglia.
Down
  1. 1. The excurrent pore, the opening of a sponge's body that expels water
  2. 3. The free-swimming, umbrella-shaped stage in the life cycle of cnidarians; reproduces sexually.
  3. 4. A tissue that covers or lines a structure in animals.
  4. 5. Long, movable limbs used to catch prey.
  5. 6. The osculum, the opening of a sponge's body that expels water.
  6. 7. The internal cavity of cnidarians where digestion and food circulation occur.
  7. 8. The sponge's "skeleton."
  8. 9. The inner cellular layer of the digestive tract of cniidarians.
  9. 11. A loosely organized, mainly mesodermal embryonic tissue that develops into connective and skeletal tissues.
  10. 12. A stinging cell that contains poisonous barbs, coiled threads, or a sticky substance.
  11. 13. A small freshwater cnidarian commonly found in quiet lakes or ponds.
  12. 18. Stinging cells containing nematocysts, used for defense.
  13. 20. A sessile, tubular cnidarian with a mouth and tentacles at one end and a basal disc at the other; reproduces asexually.
  14. 21. The jellylike layer found between the ectoderm and the endoderm of the cnidarians.