You examine an archeological site thought to be from the earliest settlement of humans in America. You measure the ratio carbon-14/carbon-12 from an artifact at the site and obtain 0.2 parts per trillion. Currently in the atmosphere, this ratio is 1.3 parts per trillion. How long ago do you predict that humans settled America?
a. 36000 years ago
b. 15500 years ago
c. 6250 years ago
d. 6750 years ago
e. 22500 years ago
f. 1280 years ago
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