Hydrostatic elements of vertebrates that have bony endoskeletons include:

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Intervertebral disks are hydrostatic elements of vertebrates that have bony endoskeletons. These disks are found between the vertebrae and function to absorb shock and provide flexibility to the spine. Choices A, C, and D are not hydrostatic elements but rather refer to different structures in the body such as cytoskeletal proteins, ligaments, and keratinized coverings of animal horns.

Hydrostatic Elements of Vertebrates That Have Bony Endoskeletons Include