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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. an independent and immature form of an organism that is morphologically different from the adult form
  3. 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 True/False questions

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


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


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


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