Which is not correct concerning cephalocaudal folding of the embryonic disc?
A. It occurs before the primary germ layers have formed.
B. It occurs because of differential growth in different regions of the embryonic disc.
C. It helps create the future head and buttocks regions of the embryo.
D. It occurs during the late third and fourth weeks of development.
E. It occurs in the cephalic and caudal regions of the embryo.
Answer: A
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