Which statement describes the best example of an observational study? O A. A scientist measures the height of different mountains in Asia.
O B. A scientist measures the height of trees before and after they are
given fertilizers.
O C. A scientist measures the speed of a river without a dam and
compares it to the speed of a river with a dam.
O D. A scientist measures the weight of bears in protected habitats and
compares it to the weight of bears outside protected habitats.

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Explanation:

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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