In mammals, the chorion and the trophoblast cells interact with the maternal uterus to form a(n) _______, which provides the embryo with nutrients and gas exchange.

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The placenta forms from the interaction between the chorion and the trophoblast cells with the maternal uterus. It provides the developing embryo with nutrients and gas exchange. The umbilicus is the physical connection between the embryo and the placenta through which nutrients and waste are exchanged. The amniotic sac contains the amniotic fluid in which the embryo develops. The yolk sac is involved in providing nutrients to the developing embryo in some animal species. The allantois is involved in waste storage and gas exchange in some animal species but does not play a significant role in placental mammal development.

In Mammals, the Chorion and the Trophoblast Cells Interact with the Maternal