toplearner1254 toplearner1254

22-05-2018
Biology

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An embryo is called a(n) ________ when it reaches around 100 cells, and appears to be a hollow, ball-like structure.

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Diatonic254 Diatonic254

31-05-2018

The answer is blastocyst. It contains a mass of cells in the inside and a blastocoele which is fluid-filled and an enveloping layer of cells (trophoblast).The inner mass will differentiate into the endoderm and consequently the internal organs. The formation of this blastocyst from an embryo is called gastrulation.

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