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
Answer: b
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Biology
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