Answer:
The
uterus prepares itself every month to receive and nurture the growing embryo.
The lining thickens and is richly supplied with blood to nourish the growing
embryo.
The embryo gets nutrition from the mother's blood with the help of a
special tissue called placenta. This is a disc which is embedded in the uterine
wall. It contains villi on the embryo's side of the tissue. On the mother's
side are blood spaces, which surround the villi. This provides a large surface
area for glucose and oxygen to pass from the mother to the embryo.
The developing embryo will also generate waste substances
which can be removed by transferring them into the mother's blood through the
placenta.
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