Which describes why radioisotopes can be used as tracers in studying the biological and chemical processes of plants?

A radioisotope of an element has the same chemical properties as its nonradioactive form, so the plant processes and uses both in the same way. Its radioactivity lets researchers track where it goes during biological and chemical processes. The choice “the radioisotope is chemically identical to the nonradioisotope the plant normally uses” gives the reason it works as a tracer.

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