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

Respuesta :

I believe it is b) hydrogen if that helps
Its Oxygen because milk is a carbohydrate and glass is a silicone dioxide. They both have oxygen. Air (which we breathe in) has oxygen. Iron oxide also has oxygen! 
Hope this helped!! :)

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