This group of deuterostomes is characterized by a water vascular system and calcium carbonate endoskeletons.

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Echinoderms, such as starfish and sea urchins, have a unique water vascular system that helps them with movement and feeding. They also have calcium carbonate endoskeletons, which provide support and protection. Chordates, another group of deuterostomes, have a notochord and a dorsal nerve cord, but do not have a water vascular system or calcium carbonate endoskeletons. Birds and Chondrichthyes (cartilaginous fish) are not deuterostomes but are in different branches of the animal kingdom. Hominins are a group of primates belonging to the same family as humans.

This Group of Deuterostomes Is Characterized by a Water Vascular