The major source of the genetic diversity among microorganisms upon which natural selection operates is .

Explanation:

The major source of the genetic diversity among microorganisms upon which natural selection operates is Mutation

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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