A) In frogs, it begins in the animal hemisphere
B) In sea urchin, it produces only two germ layers
C) In birds, it produces an epiblast and hypoblast
D) In mammals, the blastopore is a long groove in the epiblast.
Correct Answer: C
Solution :
The first step in the gastrulation of birds involves delamination. This separates an outer epiblast (presumptive ectoderm and mesoderm) from an inner hypoblast (presumptive endoderm).
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