why do we need oxygen ?
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We need oxygen because oxygen gets into our cells and tissues via the lungs. the lungs breath in oxygen from the air, then pass the oxygen into the blood stream.
without oxygen we cannot live and our lives is not possible.
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oxygen helps organisms grow, reproduce, and turn food into energy. Humans get the oxygen they need by breathing through their nose and mouth into their lungs. Oxygen gives our cells the ability to break down food in order to get the energy we need to survive.
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