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Which two substances are elements? A. sand and air B. salt and sand C. iron and helium D. helium and water
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Which two substances are elements?

A. sand and air B. salt and sand
C. iron and helium
D. helium and water

User Loosebazooka
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1 Answer

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C, iron and helium are elements since they consist of only one type of atoms
User Anwuna
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