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The ectoderm is the outermost germ layer in animals. It gives rise to the skin, nervous system, and sense organs. In the early embryo, it is the first layer to form from a fertilized egg. The ectoderm cells are constantly moving and changing as they develop into different tissues.

The ectoderm is the outermost germ layer in animals. It gives rise to the skin, nervous system, and sense organs. In the early embryo, it is the first layer to form from a fertilized egg. The ectoderm cells are constantly moving and changing as they develop into different tissues.