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4 Written questions

3 Multiple choice questions

  1. any of the flagellate cells that line the cavities
  2. a needle of silica or calcuim carbonate in the skeleton of some sponges
  3. one of the small openings in a sponge's body through which water enters

3 True/False questions

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

          

  2. epidermisthe outer surface layer of cells of a plant or animal

          

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

          

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