The carbon dating is based on

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(B) Carbon dating is a method used to determine the age of organic materials by measuring the amount of the radioactive isotope $_6^{14}C$ present in

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$_6^{14}C$

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(B) Carbon dating is a method used to determine the age of organic materials by measuring the amount of the radioactive isotope $_6^{14}C$ present in the sample. This isotope is continuously produced in the upper atmosphere by cosmic rays and is incorporated into living organisms. After the organism dies,the uptake of $_6^{14}C$ stops,and it begins to decay at a known rate,allowing scientists to estimate the time elapsed since death.

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