1.

Why is radiocarbon dating not good for material more than 30,000 years old?

A. Because all animals emitted radiocarbon before that time
B. Because radiocarbon was not present anywhere before that time
C. Because the amount of C14 becomes almost immeasurably small in 30,000 years
D. Because carbon extraction was not known before 30,000 years
Answer» D. Because carbon extraction was not known before 30,000 years


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