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

Question

Quizplus · Accepted Answer

The nervous system begins as a tube surrounding a fluid-filled cavity in the developing embryo. This structure eventually develops into the brain and spinal cord.

Early in Development, the Nervous System Begins as a ____