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We would not be here if it weren't for oxygen.What are they used for? - Elements!Did you know that Iron is the most abundant element on Earth?Helium and Hydrogen are the most abundant elements in the universe!The most common compound that is used by us humans is H2O. he is right, water!What are they used for? - Compounds!The two most common examples of mixtures are cement and salt water.What are t
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