VAN-0082
QUESTION
The germ layer formed first in the embryo?
OPTIONS
(A) Ectoderm
(B) Mesoderm
(C) Endoderm
(D) Neural crest cell
ANSWER
(C) Endoderm
EXPLANATION
The endoderm is the first definitive germ layer formed during gastrulation, followed by mesoderm and ectoderm. Neural crest cells arise later from ectoderm and are not one of the three primary germ layers formed first.
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