Cephalization is absent in

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(D) Cephalization refers to the evolutionary trend of concentrating nervous tissue and sensory organs at the anterior end of an organism,forming a dis

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Echinoderms

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(D) Cephalization refers to the evolutionary trend of concentrating nervous tissue and sensory organs at the anterior end of an organism,forming a distinct head or brain.In the phylum $Echinodermata$,cephalization is absent.Adult echinoderms exhibit radial symmetry and lack a centralized brain; their nervous system consists primarily of a nerve ring and radial nerve cords.

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