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4 Written questions

3 Multiple choice questions

  1. the outer surface layer of cells of a plant or animal
  2. any of the flagellate cells that line the cavities
  3. a needle of silica or calcuim carbonate in the skeleton of some sponges

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


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