Which term refers to an extra-embryonic membrane that secretes fluid around the developing embryo?

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The amnion is an extra-embryonic membrane that surrounds the developing embryo and secretes amniotic fluid, which serves as a protective cushion for the developing embryo. The yolk sac, on the other hand, produces blood cells and also gives rise to germ cells. The allantois helps with gas exchange and contributes to the formation of the umbilical cord. The shell is an outer layer found in some types of eggs that provides protection and regulates gas exchange.

Which Term Refers to an Extra-Embryonic Membrane That Secretes Fluid