Worms use a hydrostatic skeleton to generate movement. How do they do this? Select one: The term hydrostatic simply refers to moist environment. They generate movement just as arthropods do. Their bones are filled with water, which provides the weight of the skeleton. The change in body structure is caused by contraction of muscles compressing the watery body fluid. The muscles contain water vacuoles, which, when filled, provide a rigid internal structure.

The correct answer is the third statement.

Explanation:

To hold the bodies together, to keep them incline, and to permit for movement, all the animals require support structures. There are three kinds of support systems found in animals, that is, exoskeleton, hydrostatic skeleton, and the endoskeleton. Of the mentioned support systems, the hydrostatic skeleton is used by worms for movement.  

In the worms, a fluid-filled cavity known as coelom, and the fluid known as coelomic fluid is found between the muscles and the digestive tract. This coelomic fluid works as a hydrostatic skeleton. In worms, movement takes place by contraction of muscles that compress the coelomic fluid, that is, the watery body fluid resulting in the change in body composition.  

b. the change in body structure is caused by contraction of muscles compressing the watery body fluid.

Explanation:

The hydrostatic skeletons utilize the fluid filled cavity for locomotion as the fluid or water is incompressible, so the muscles contraction will become smooth and organism can apply force on the fluid cavity to change the shape of the body to facilitate the locomotion.

The worms have the rings of muscles that are filled with water this makes the whole body hydrostatic in nature that facilitates the smooth movement.

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