Do crustaceans have a skeletons

Yes, crustaceans have an exoskeleton, which is a hard outer structure that provides support and protection to their bodies. This exoskeleton is primarily made of chitin, a tough polysaccharide, and must be molted periodically as the crustacean grows. Unlike vertebrates, crustaceans do not have an internal skeleton; instead, their exoskeleton serves as both a skeleton and a protective armor.