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QUESTION
During formation of the embryonic disk, ectoderm is adjacent to the __________ , and endoderm is adjacent to the __________ .
During formation of the embryonic disk, ectoderm is adjacent to the __________ , and endoderm is adjacent to the __________ .
A)amniotic cavity, blastocele
B)amniotic cavity, yolk sac
C)blastocele, amniotic cavity
D)yolk sac, amniotic cavity
E)yolk sac, blastocele
