How to acquire oxygen

Subterranean mammals also have to cope with problems from the burrow atmosphere. The oxygen concentration may be as low as 6%, compared to 21% prevailing in the ambient atmosphere at sea level altitude. This means that the oxygen concentration even a few inches underground may be lower than that on Mount Everest. The carbon dioxide concentration in burrows ranges between 0.5-13.5% (compared to 0.03% in the above ground atmosphere). Surprisingly, some f

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