what dangers will have to face if the proportions of oxygen and nitrogen in the undergo toa change?

If the proportion of O2 and N2 change in atmosphere , we will face following danger:
1) Due to increases in O2 level , every thing can burn easily and then it will be difficult for survival.
2) The lower concentration of O2 will pose difficulty for respiration and then even survival will be difficult.
3) The atmospheric nitrogen is important for plant growth. Its decreased % will effect the plant growth badly.

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