GENERAL HISTOLOGY

Detailed explanation-1: -On the other hand, echinoderms have a well-developed coelom and a complete digestive system.

Detailed explanation-2: -Echinoderms have a simple digestive system with a mouth, stomachs, intestineand anus. In many, the mouth is on the underside and the anus on the top surface of the animal. Sea stars can push their stomachs outside of their body and insert it into its prey allowint them to digest the food externally.

Detailed explanation-3: -The Echinoderm Digestive System Their digestive system consists of four main parts: the mouth, stomach, intestines, and anus. Given their pentaradial symmetry and unusual body shapes, their mouths are almost always on the underside of their bodies, and the hole located at the top of their body is actually the anus.

Detailed explanation-4: -The correct answer is (b). Echinoderms do not have gills.

Detailed explanation-5: -The echinoderms are a group of animals that includes starfish, sea urchins, and sand dollars. These animals are more complex than mollusks and arthropods for several reasons. One reason is that echinoderms have a true coelom, which is a fluid-filled cavity that helps to support and protect the animal’s organs.