Which of the folliwing ànimals does not display segmentation?

Among the listed animals, echinoderms, such as starfish, do not display segmentation. Segmentation refers to the division of the body into repetitive segments, which is seen in animals like annelids (earthworms) and arthropods (insects and crustaceans). Echinoderms have a unique body plan characterized by radial symmetry and a water vascular system, rather than the segmented structure found in other groups.