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an element cannot be broken down by chemical reactions and is made up of only one kind of A. eclectron B.carbohydrate C.atom D.molecule

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An element cannot be broken down by chemical reactions and is made up of only one kind of atom. Those are also known as pure substances, because they are made of of only one type of atom. 
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Elements are the building blocks of large molecules, and are made up by a certain configuration of protons, neutrons, and electrons, otherwise known as an atom. The answer is .C
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