Because all structures develop from them,the morula and blastocyst are called the primary germ layers.

Name: Because all structures develop from them,the morula and blastocyst are called the primary germ layers.
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The primary germ layers are actually formed during gastrulation, which follows the formation of the blastocyst. The blastocyst and morula are important early developmental stages, but they do not give rise to the primary germ layers themselves.

Because All Structures Develop from Them,the Morula and Blastocyst Are