Cory is explain the principle of superposition to his friend which of the following is the best explanation corey could give a. layers of rock are usually made of completely different substances b. in an area of undisturbed rock the oldest layer of rock will be on the bottom c. the age of rocks can be determined by the ratio of radioactive isotopes present d. to estimate the age of rocks i could really use fossils embedded in the rock layers

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Explanation:

C.The age of rocks can be determined by the ratio of radioactive isotopes

present

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

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