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4 Written questions

3 Multiple choice questions

  1. a needle of silica or calcuim carbonate in the skeleton of some sponges
  2. within the body wall of a sponge, a specialized cell that crawls about and delivers nutrients from the choanocytes to the rest of the body cells
  3. one of the small openings in a sponge's body through which water enters

3 True/False questions

  1. heterotrophthe outer surface layer of cells of a plant or animal

          

  2. gemmulean asexual reproductive structure produced by some freshwater sponges

          

  3. choanocytewithin the body wall of a sponge, a specialized cell that crawls about and delivers nutrients from the choanocytes to the rest of the body cells

          

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