In the mammalian embryo, the first structure to develop relationship with the wall of the uterus is
The amnion
The inner cell mass
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The allantois
The trophoblast
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Answer:
The trophoblast is the first structure to develop a connection with the uterine endometrium.
Explanation:
The embryo differentiates into trophoblast (which gets interdigitated with the uterine wall to form a placenta) and formative cells/ inner cell mass( which forms the embryo proper).
Amnion and allantois develop later as membranes around the embryo.
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