EVERYDAY SCIENCE

Detailed explanation-1: -Echinoderms have a water-driven tube system that the members of this phylum use for their locomotion . This system is also known as the water vascular system.

Detailed explanation-2: -Echinoderms are characterized by a unique coelomic water vascular system. This is a hydraulically controlled system consisting of a circumoral ring around the esophogus with connecting radial canals each leading to an ambulacrum.

Detailed explanation-3: -Define Echinoderm. Invertebrates with an internal skeleton and a system of fluid-filled tubes called a water vascular system. Examples: sea cucumbers, sea starts, sea urchins, and sand dollars.

Detailed explanation-4: -While many echinoderms do begin life as a bilateral larva, later they become radial with five-part symmetry and no central brain. The bodies of echinoderms are made of hard calcium-based plates that are often spiny and always covered by a thin skin. The echinoderm skeleton is thus on the inside-called an endoskeleton.

Detailed explanation-5: -Echinoderms possess a unique ambulacral or water vascular system, consisting of a central ring canal and radial canals that extend along each arm. Water circulates through these structures and facilitates gaseous exchange as well as nutrition, predation, and locomotion.