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Early in development, the nervous system begins as a ______. A. tube surrounding a fluid-filled cavity B. spherical structure in the center of the embryo C. diffuse system of cells scattered throughout the body D. single layer of cells covering the heart and other internal organs

Sagot :

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Early in development, the nervous system begins as a tube surrounding a

fluid-filled cavity.

The tube which surrounds the fluid-filled cavity is referred to as neural tube.

The tube gives rise to the central and peripheral nervous system as

development occurs.

The inner part of the tube thickens to form the central nervous system

which consists of the brain and spinal cord while the outer region forms

the peripheral nervous system.

Read more on https://brainly.com/question/869589

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