Most mollusks are free-living multicellular animals that have a multilayered calcareous shell or conch on their backs. This exoskeleton provides support for the soft organs including a muscular foot and the organs of digestion, respiration, excretion, reproduction, and others. Is molluscum contagiosum an STD? molluscum contagiosum std symptoms.

Are Mollusca multicellular or unicellular?

Yes, molluscs are all multicellular.

How is Mollusca classified?

Mollusks can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda. These classes are distinguished by, among other criteria, the presence and types of shells they possess.