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4 Written questions

3 Multiple choice questions

  1. the outer surface layer of cells of a plant or animal
  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. any of the flagellate cells that line the cavities

3 True/False questions

  1. gemmulea needle of silica or calcuim carbonate in the skeleton of some sponges

          

  2. ostiaan opening in a sponge's body through which water exits

          

  3. osculuman opening in a sponge's body through which water exits