The type of skeleton that is an internal support structure is a(an):

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Endoskeletons are internal support structures found in animals such as vertebrates and echinoderms. They provide both support and protection for the animal's internal organs. Hydrostatic skeletons, such as those found in cnidarians and some worms, use a fluid-filled cavity to provide support and movement. Gastrovascular cavities, as found in animals such as jellyfish and flatworms, are used for both digestion and distribution of nutrients. Exoskeletons, such as those found in arthropods, are external hard structures that provide support and protection. Vascular canals are structures found in plants, and are used for transporting water and nutrients.

The Type of Skeleton That Is an Internal Support Structure