Gastrulation is the process through which the three primary germ layers $($the endoderm, the ectoderm, and the mesoderm$)$ are formed.

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is the germ layer that will differentiate into structures likeskeletal muscles, the heart, the kidneys, andall connective tissues.

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is the layer that will differentiate into manydigestive organs, as well as theinternal epithelial liningsof the respiratory, digestive, urinary tracts.

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is the layer that will differentiate intothe nervous systemandepidermis.