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With two thirds of the earth's surface covered by water and the human body consisting of 75 percent of it, it is evidently clear that water is one of the prime elements responsible for life on earth. Water circulates through the land just as it does through the human body, transporting, dissolving, replenishing nutrients and organic matter, while carrying away waste material. Further in the body, it regulates the activities of fluids, tissues, cells, lymph, blood and glandular secretions.

       An average adult body contains 42 litres of water and with just a small loss of 2.7 litres he or she can suffer from dehydration, displaying symptoms of irritability, fatigue, nervousness, dizziness, weakness, headaches and consequently reach a state of pathology. Dr F. Batmanghelidj, in his book 'your body's many cries for water', gives a wonderful essay on water and its vital role in the health of a water 'starved' society. He writes: "Since the 'water' we drink provides for cell function and its volume requirements, the decrease in our daily water intake affects the efficiency of cell activity........as a result chronic dehydration causes symptoms that equal disease..."

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the answer is too good but i wanted it hindi. No issues I'll translate it.
कहते हैं जल ही जीवन है। जल के बिना धरती पर मानव जीवन की कल्‍पना भी नहीं की जा सकती। मनुष्‍य चांद से लेकर मंगल तक की सतह पर पानी तलाशने की कवायद में लगा है, ताकि वहां जीवन की संभावनायें तलाशी जा सकें। लेकिन, क्‍या धरती पर रहने वाले हम पानी के वा‍स्‍वितक मूल्‍य को समझते हैं। कहते हैं पानी तो जितना पियो उतना कम है। लेकिन, क्‍या यह बात पूरी तरह से सही है। शायद नहीं! जरूरत से ज्‍यादा पानी पीना भी सेहत को नुकसान पहुंचा सकता है। अति हर चीज की बुरी होती है और पानी भी कोई अपवाद नहीं। पानी कार्बोहाइड्रेट्स, प्रोटीन और वसा की तरह ही पोषण का काम करता है।
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