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Development progresses_________ .


A) from the midline lateral to the body walls, then proximal to distal on the limbs
B) in rostral to caudal and proximal to distal directions
C) simultaneously upwards, outwards, and downwards from the trunk
D) from the head and the distal limbs towards the trunk

E) A) and C)
F) A) and B)

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The_________ is the final product of cleavage.


A) trophoblast
B) blastocyst
C) gastrula
D) zygote

E) B) and C)
F) A) and B)

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What is true of the structure of the human placenta?


A) It is diffuse, with villi distributed over the surface of the chorion.
B) It forms a belt around the embryo.
C) It is disc- shaped.

D) None of the above
E) All of the above

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