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Why Do We Need Oxygen To Survive?

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Anonymous answered
We need oxygen to act as a final electron acceptor in the electron transfer phosphorylation and combine with H+ to form water. We need a final electron acceptor because if you don't take electrons off of a complex 4 in the electron transfer system then the entire system gets backed up and the electrons can't move from complex 3 to complex 4, or from 2 to 3, or from 1 to 2.  This means you can't pump electrons and cannot create a gradient which ultimately means there is no production of ATP and without ATP you have no energy. So basically you need oxygen in order to create energy.
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rohan baghel answered
We need to oxygen to burn our food material present in our blood . The burned food gives us energy to survive.

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