16. Radioactive isotopes are applied to measure the age of fossil, what term describes the time it requires for exactly one-half of a given amount of a radioactive isotope of an element to decay?
(A) decay time
(B)decay product
(C)half-life
(D)half-decay
(E) useful dating range

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統計： A(0), B(0), C(35), D(12), E(0) #2345004