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4 Written Questions

3 Multiple Choice Questions

  1. the outer surface layer of cells of a plant or animal
  2. an asexual reproductive structure produced by some freshwater sponges
  3. an organism that obtains organic food molecules by eating other organisms or their byproducts and that cannot synthesize organic compounds from inorganic materials

3 True/False Questions

  1. ostiaone of the small openings in a sponge's body through which water enters

          

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

          

  3. spongina fibrous protein that contains sulfur and composes the fibers of the skeleton of some sponges

          

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