The respiratory and digestive systems in the embryo develop from the

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The respiratory and digestive systems develop from the endoderm layer of the embryonic disk, which forms the lining of the gut tube, including the respiratory tract, esophagus, stomach, intestines, liver, and pancreas. The ectoderm layer forms the nervous system and skin, while the mesoderm layer forms the muscles, skeleton, and circulatory system. The neural tube gives rise to the brain and spinal cord.

The Respiratory and Digestive Systems in the Embryo Develop from the