Why we need oxygen
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Oxygen is essential for respiration because the body uses it to 'burn' food molecules. Animals take in oxygen when inhaling and give off carbon dioxide when exhaling. Oxygen makes up almost 21% of the total gases in air, with most of the remaining gas being physiologically inert nitrogen.
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we need oxygen because it is needed to burn
the fuel (sugars and fatty acids) in our cells to produce energy.
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