Once pregnancy has been established,a temporary organ called ______ develops on the uterine wall to serve as a transfer station for nourishment and oxygen from mother to the fetus,and for waste products from the fetus to mother.

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Once pregnancy has been established, the placenta develops on the uterine wall to serve as a transfer station for nourishment and oxygen from mother to the fetus, and for waste products from the fetus to mother. The umbilical cord connects the fetus to the placenta, but it is not a temporary organ. Blastula refers to the early stage of embryonic development, and afterbirth refers to the placenta and fetal membranes that are expelled from the mother's body after childbirth.

Once Pregnancy Has Been Established,a Temporary Organ Called ______ Develops