. The placenta in mammals is formed by-
A.AllantoisB.Chorion and allantois
C.AmnionD.Yolk sac
Best Answer
B. In mammals the placenta is made up of - Amnion: A thin, tough, membranous sac that encloses the embryo. It is filled with a serous fluid in which the embryo is suspended. - Chorion: The outer membrane enclosing the embryo in reptiles, birds, and mammals. In placental mammals it contributes to the development of the placenta.
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