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Gastrula is the stage of the embryonic development of frog in which:

[A].	The embryo has three primary germ layers	[B].	Embryo is a hollow ball of cells with a single cell thick wall
[C].	Embryo has ectoderm, endoderm and a blastopore	[D].	Embryo has ectoderm, endoderm and a rudimentary nervous system

Answer: Option A