The type of skeleton that is usually composed of either a calcium containing shell or chitin is a(an):

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Exoskeletons are hard outer coverings found in many invertebrates, such as insects, crustaceans, and mollusks. They are usually composed of chitin or a calcium-containing shell. Endoskeletons, on the other hand, are internal support structures found in vertebrates. Hydrostatic skeletons are soft-bodied structures that use fluid pressure to provide support, while gastrovascular cavities and vascular canals are not types of skeletons at all.

The Type of Skeleton That Is Usually Composed of Either