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The following statements concerning petroleum are all true except: A. It was probably formed from the remains of ancient marine organisms. B. It is a thick, dark liquid composed mostly of hydrocarbons. C. Some of the commercial uses of petroleum fractions include gasoline and kerosene. D. All of its hydrocarbon chains contain the same number of carbon atoms. E. It must be separated into fractions (by boiling) in order to be used efficiently.
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