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The age of fossils can be traced by using isotopes C12 and C14 called Carbon dating for generations

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Jonalee123viz
It is a method to determine the age of plants and fossils. Carbon has three naturally occurring isotopes, C12, C13 and C14. Of the three, C14 is radioactive in nature and has a half-life (decays to half the strength) of 5,730 years.