All of the following, except a might be studied by a microbiologist

plants

Explanation:

segmentation=endoskeleton=backbone=coelom=tissues

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