As a result of the transverse and longitudinal folding of the embryo:

waelhammad

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2022-11-06

the prochordal membrane is moved ventrally and caudally
a portion of the yolk sac becomes more intimately incorporated into the embryonic body
the primitive groove is moved cranially and dorsally
both A and B
all of the above (A-C)

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waelhammad

2022-11-06

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D. both A and B

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