What is the difference between components of yolk sac and allantois?
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Birds and other egg-laying vertebrates have four different extraembryonic membranes: the chorion, the allantois, the yolk sac, and the amnion. ... The allantois is the sac-like extraembryonic membrane that removes waste from the embryo. As the embryo grows, so does the allantois, eventually pressing against the chorion.
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