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4 Written questions

3 Multiple choice questions

  1. an opening in a sponge's body through which water exits
  2. any of the flagellate cells that line the cavities
  3. the outer surface layer of cells of a plant or animal

3 True/False questions

  1. amoebocytewithin 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

          

  2. spongina needle of silica or calcuim carbonate in the skeleton of some sponges

          

  3. heterotrophan organism that obtains organic food molecules by eating other organisms or their byproducts and that cannot synthesize organic compounds from inorganic materials

          

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