During the blastocyst stage, there are three cell layers evident.

Name: During the blastocyst stage, there are three cell layers evident.
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During the blastocyst stage, there are two main structures evident: the inner cell mass (which will develop into the embryo) and the trophoblast (which will develop into the outer layers of the placenta), not three cell layers. The three cell layers (ectoderm, mesoderm, and endoderm) become evident later during the gastrulation process.

During the Blastocyst Stage, There Are Three Cell Layers Evident