An amniotic sac is the sac in which the foetus develops in
mammals, reptiles and birds.
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Grasshoppers do not have an amniotic sac. Animals with amniotic
sacs are mammals and birds that have a sac for the fetus to grow
and gain nourishment from.
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The protective sac around the embryo or fetus is the amniotic sac.
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Amniotic sac and fluid has a protective functions for the fetus.
This sac separates the fetus from the mothers tissue.