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OpenStudy (anonymous):

Which element is found in all of the following: iron oxide, air, milk, and glass? A) carbon B) hydrogen C) oxygen D) silicon

OpenStudy (preetha):

Oxygen

OpenStudy (preetha):

You have to know a little bit about the chemical composition of iron oxide, milk and glass. Milk is a carbohydrate, and glass is silicon dioxide. Both have oxygen. Air has oxygen (we breathe it) and iron oxide clearly does!

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