The half-life of carbon-14 is 5,600 years. A fossil that has one-eighth the normal proportion of carbon-14 to carbon-12 is probably
A. 5,600 years old.
B. 11,200 years old.
C. 22,400 years old.
D. 2,800 years old.
E. 16,800 years old.
Answer: E
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Activated by directly binding to GTP
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Which structure is considered part of both the digestive tract ad the respiratory tract?
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