Adult echinoderms that have radial symmetry lack:

Question

Quizplus · Accepted Answer

Adult echinoderms with radial symmetry, such as sea stars and sea urchins, lack a distinct head. Instead, they have a decentralized nervous system with nerve cords running along their arms or body. They do have a coelom, a method of movement through their water vascular system, and a tube-like gut with a separate mouth and anus. Some species of echinoderms do have nervous tissue, but it is not organized into a central brain or head.

Adult Echinoderms That Have Radial Symmetry Lack