Your text describes three types of skeletons explain how a hydrostatic skeleton works

 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.

some fungi obtain their nutrients from a living host (plant or animal) and are called most biotrophic fungi have fairly narrow host ranges—they are specialized on a limited called rhizomorphs that allow the fungus to grow from one tree to another. ascospores are formed inside a sac-like structure called an ascus. so your answer is a