the developing embryo is protected by the amniotic fluid
within the uterus, surrounding the embryo is a fluid called the amniotic fluid
one of the functions of the amniotic fluid is to protect the embryo, this is possible because the fluid is made largely of water which cannot be compressed
the fluid absorbs any pressure on the outside wall of the uterus preventing damage to the unborn child
(it is hard to create great force within water)
there is an other function which is that floating because the bones cannot support the child as they are not calcified (hard) at that time
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