Cephalization is most commonly associated with

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Cephalization is the evolutionary development of a head and brain, and is seen primarily in animals with bilateral symmetry. Bilateral symmetry allows for the development of a distinct anterior (head) end, which can be specialized for sensory and feeding functions. Spherical and radial symmetry do not involve distinct orientations or directions, so cephalization does not occur in organisms with these types of symmetry. Sessile animals may have specialized areas for feeding, but do not require cephalization. Lophotrochozoan animals refers to a phylum or group of animals, and while many of these animals have bilateral symmetry, not all are cephalized.

Cephalization Is Most Commonly Associated with