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The eutherian placenta is derived from or In mammals placenta is formed by
(a)Yolk sac
(b)Amnion
(c)Allantois
(d)Chorion allantois

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Important Questions on Human Reproduction
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Human chorionic gonadotropin is secreted by
Or
In mammals the chorion and the allantois together form
Or
Several hormones like , estrogen, progesterone are produced by

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