An embryo is directly nourished by root-like extensions from the

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The chorion is a membrane that surrounds the embryo and is responsible for gas exchange and the direct nourishment of the developing fetus via root-like extensions called chorionic villi. The amnion is a separate membrane that surrounds the embryo and is filled with amniotic fluid, which helps protect the fetus from physical shock. The blastula is an early stage of embryo development and does not provide nourishment to the growing fetus. The zygote is the initial cell formed by the union of sperm and egg and does not itself provide direct nourishment to the developing embryo.

An Embryo Is Directly Nourished by Root-Like Extensions from the