The hair, the outer layer of skin, and the nervous system develop from the

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The hair, the outer layer of skin, and the nervous system all develop from the ectoderm, which is one of the three primary germ layers that forms in the early stages of embryonic development. The endoderm gives rise to the lining of the digestive and respiratory tracts, while the mesoderm develops into various organs and tissues, including muscle, bone, and blood vessels. The germ disc is a term used to describe the group of cells in the early embryo that eventually give rise to all of the body's tissues and organs, but it is not one of the three germ layers specifically.

The Hair, the Outer Layer of Skin, and the Nervous