Answer:
B. Hydrostatic skeletons
Explanation:
Hydrostatic skeletons are found in organisms with soft bodies like earthworms, jellyfishes, some starfishes and the like. It is formed by coelem, a fluid-filled compartment, which supports the organisms' structures and organs with the use of hydrostatic pressure. It protects the body from external pressures. They move through muscle contractions, which changing the shape of the coelem .
