The first obvious sign that the nervous system is forming in the embryo is the thickening of the surface ectoderm to form the neural plate.

Name: The first obvious sign that the nervous system is forming in the embryo is the thickening of the surface ectoderm to form the neural plate.
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Question

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The neural plate is the first visible structure that indicates the development of the nervous system in an embryo, formed by the thickening of the ectoderm.

The First Obvious Sign That the Nervous System Is Forming