The simplest animals to display cephalization and centralization of the nervous system are

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Flatworms have a distinct head region with specialized sensory structures and ganglia, showing cephalization. They also have a central nervous system consisting of a pair of nerve cords running longitudinally along the body, showing centralization of the nervous system. Echinoderms, cnidarians, and sponges do not have the same level of distinct nerve structures or centralized nervous systems as flatworms.

The Simplest Animals to Display Cephalization and Centralization of the Nervous