During gastrulation,

Question

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Gastrulation is the process by which the single-layered blastula is transformed into a triple-layered embryo, consisting of ectoderm, mesoderm, and endoderm. This process leads to the formation of the three germ layers, which will give rise to all of the organs and tissues of the body. A) is incorrect because blastomeres do not fuse during gastrulation. B) is incorrect because the placenta does not form until later in gestation. E) is incorrect because the neural tube closure occurs after gastrulation is complete.

During Gastrulation