cbencau

Years ago my brother explained to me (I'm not sure where he learned it) a large portion of the metabolic wastes are exhaled, having been converted to CO2, O2 or other gases. From Wikipedia: "By mass, human cells consist of 65–90% water (H2O). Oxygen therefore contributes a majority of a human body's mass. Almost 99% of the…

Thanks, had some trouble with that.

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