If you are examining rock layers that are suspected to be about 20 million years old, which radioactive isotope would you use? Explain your answer.

Radiometric dating.

Explanation:

Absolute dating is the scientific process of finding out the age of an object or artifact by anthropologists.

Radiometric dating is much like absolute dating but it uses parent isotopes to measure and determine age of rock particles

clinically, some people often have repeated allergies, eczema and respiratory infections or other parts of the infection, in this case, in addition to some routine tests such as tests for white blood cells, immunoglobulin series, lymphocyte subsets, etc., the five immune immunoglobulin tests are also necessary.

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