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80% of human body is of water, water in biosystems enables biological functions.We're dependent on the day-to-day availability of fresh, clean water. We lose water through perspiration, urination and by exhalation—we breathe out water vapor. A typical woman needs about 2.7 liters (0.7 U.S. gallons) of water per day. A typical man needs about 3.7 liters (one U.S. gallon) per day.
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