In organism or
animals with hydrostatic skeletons the muscles contract the shape of the coelom
and this is the reason there is the movement because of the pressure of the
fluid inside the fluid filled cavity. Hydrostatic skeleton this a fluid filled
gastrovascular cavity or coelom. It offers resistance and support to the contraction
muscles for motility. It is also a structure found mostly in soft bodied animals
that consist of a cavity filled with fluid and the coelom, surrounded by
muscles.
