Tracer elements are:

isotopes

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dietary minerals

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microelements

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macroelements

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Solution

The correct option is A isotopes
Tracer elements are widely used in biological research and various diagnostic techniques. Tracer elements are radioactive isotopes that function like normal elements but emit radiations. They can therefore be located by geiger muller counter or a scintillation counter and autoradiography. eg $H - 3, C - 14, P - 32, 35 - S$ etc.

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