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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. 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. choanocyteany of the flagellate cells that line the cavities

          

  2. ostiaan independent and immature form of an organism that is morphologically different from the adult form

          

  3. larvaeone of the small openings in a sponge's body through which water enters