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A skull fragment from an archeological dig is found to have an activity per gram of carbon that is about 6.3 % of what is

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A skull fragment from an archeological dig is found to have an activity per gram of carbon that is about 6.3 % of what is found in currently living people. If the half-life of C-14 is 5730 years about how long ago was this person alive? 18,000 years ago 23,000 years ago 29,000 yea rs ago 34,000 years ago 40,000 years ago

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