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a single hollow tract of nervous tissue that constitutes the central nervous system of chordates and develops into the spinal cord and brain in vertebrates.
a solid double strand of nerve fibers along the length of the body in elongate invertebrates, as earthworms and insects, connecting with a pair of nerve ganglia at each body segment.
Based on the Random House Dictionary, © Random House, Inc. 2015.
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is slightly swollen near its head, but this bulge is not yet a brain.
Its nervous system, such as it is, is organized around a simple
running along its back.
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