Mollusks are known as coelomates why?

Mollusks are known as coelomates because they possess a coelom, which is a fluid-filled body cavity that lies between the body wall and the digestive organs. The coelom provides support and protection for the internal organs, and it also allows for greater freedom of movement.

Mollusks are triploblastic animals, which means that they are composed of three germ layers: the ectoderm, the mesoderm, and the endoderm. The coelom is derived from the mesoderm.

The presence of a coelom is a defining characteristic of coelomates, which is a major group of animals that also includes the annelids (segmented worms), arthropods (insects, spiders, and crustaceans), and echinoderms (sea stars, sea urchins, and sand dollars).