Describe three ways that oxygen gas is removed from the atmosphere and used?

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Maynard Keynes Profile
Maynard Keynes answered
The most common is that we humans and animals absorb oxygen through breathing, exhaled carbon dioxide.
There is by plants through photosynthesis, sunlight, water and carbon dioxide into oxygen and carbohydrates.

There is, for industrial use oxygen, he removal of other gases in the air to get pure oxygen.

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