A substance that provokes an immune response is called an

Explanation:

Antigen, called an immunogen, is a substance that provokes an adaptive immune response on its own if injected into the body. It must combine with products of the immune system (antibodies) in order for an immune response to be made.

b ti isnfornopgnoernfrof

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