Why does the air contain sufficient oxygen to breathe, even over polar regions and deserts?

Are wind patterns and microscopic plants in the seas sufficient to distribute oxygen, or are there other forces at work? Is the oxygen content higher in forests?

Ray;mond2014-06-15T22:25:16Z

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Forests often have 22% instead of 21%. Winds and air current keep the air close to the same most every where. Scarcely any oxygen is produced in Antarctica, but very little is lost there.

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Himanshu2014-06-16T07:17:23Z

Because the air constitutes of oxygen 21% and the even distribution makes us survive on the earth

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