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2015-06-04T18:20:46+08:00

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We give off carbon dioxide and plants needed them for photosynthesis
Nitrogen use to preserve food and electronic industry for production
Hydrogen use in making things float like ballon because of it's less weight
That's all I know hope it help you... :)
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2015-06-07T08:32:50+08:00
The gases that are not needed by our body will be our waste and needed by the plants etc.

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