Answers

2016-07-25T20:34:54+08:00
Oxygen is brought into the lungs via breathing, where it is trsnsported by red blood cells to the entire body to be used to produced energy
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2016-07-25T20:39:47+08:00
We breathe because oxygen is needed to burn the fuel [sugars and fatty acids] in our cells to produce energy.Oxygen is brought into the lungs via breathing,where it is transported by red blood cells to entire body to be used to produce energy.
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