give the function of amniotic sac
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The amniotic sac serves the following functions: acts as a cushion to protect the developing fetus from physical harm. acts as lubricant for the fetus' body parts.
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The amniotic sac, commonly called the bag of waters, sometimes the membranes, is the sac in which the fetus develops in amniotes. It is a thin but tough transparent pair of membranes that hold a developing embryo (and later fetus) until shortly before birth.
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