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Which is the important gas used by human being for breathing ​

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Oxygen
Oxygen is the essential component for any breathing gas, at a partial pressure of between roughly 0.16 and 1.60 bar at the ambient pressure.
User Sunchezz
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Answer:

Oxygen

Step-by-step explanation:

We breath in oxygen then breath out Carbon Dioxide that plants use to create Oxygen

User Samarth Kejriwal
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