"Nerve net" describes the nervous system of ____.

Question

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A nerve net is found in cnidarians, such as jellyfish and coral, and consists of a diffuse network of neurons that controls primitive sensory and motor functions. Flatworms also have a nerve net, but they also have a more centralized nervous system. Annelids (segmented worms) and arthropods (such as insects and crustaceans) have a ventral nerve cord and a brain, while sponges lack a nervous system altogether.

"Nerve Net" Describes the Nervous System of ____