Do exoskeletons have a back bone?

Exoskeletons do not have a backbone; instead, they are external skeletons that provide structural support and protection for organisms like insects, crustaceans, and some mollusks. Unlike vertebrates, which have an internal skeleton made of bone or cartilage, exoskeletons are typically made of chitin or calcium carbonate. These structures allow for mobility and serve to protect the organism, but they do not include a spinal column.