The oxygen we take has 8 electrons 6 in outer or valence cell and 2 in inner cells.. As oxygen goes through our body it chemical reaction occurs.. any condition can happen in body.. if oxygen loses its electrons it becomes reactive and damages the structure of dna as well as our cells.. our cells get dies.. this process continous for long decade. we get old and death happen
conclusion= oxygen is life gas and death gas.. it is base of this ecosystem.
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