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In carbon-14 dating,


A) the radioactivity of carbon is artificially induced.
B) the radioactivity of carbon occurs naturally.
C) radioactive carbon is added to the sample to be dated.
D) none of the above

E) All of the above
F) A) and C)

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Iodine-131 from radioactive fallout will concentrate in the thyroid gland.However,it has only a short half-life and therefore poses only minimal health risks to humans.

A) True
B) False

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