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Amnion
Fluid-filled sac surrounding the embryo
Protects the embryo from desiccation and mechanical shock
Yolk Sac
Allows for nutrient uptake and circulatory system development(early blood cell formation in mammals)
Allantois
Storage of waste products (umbilical vessels in mammals)
Chorion
Surrounds embryo and other membranes
Important in gas exchange between embryo and external environment (important in embryonic part of placenta in mammals)