In mammals such as humans, the chorion and allantois fuse to form the _____, an organ that allows the embryo to obtain nutrients directly from the mother.

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In mammals, including humans, the chorion and allantois fuse to form the placenta, an organ that connects the developing fetus to the uterine wall of the mother and allows for the exchange of nutrients, gases, and wastes between the mother's blood and the fetus. The amnion is a separate membrane that encloses the embryo and is filled with amniotic fluid to protect it during development. Yolk and shell are structures found in bird eggs, not in mammals.

In Mammals Such as Humans, the Chorion and Allantois Fuse