Useful+Oxygen

Oxygen is very helpful to humans that we can't even live without oxygen. Water, which we can't live without, is made out of oxygen also. There is a therapy called 'Oxygen Therapy', which is a medication for emphysema, pneumonia, and some heart diseases. Scuba divers are able to scuba dive underwater, by saving some oxygen on their tank, and using the oxygen, when they're underwater. Also people use the oxygen in a tank, when they are in space.

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