Water is one of the important substances on earth and it is the basis of life. The life is considered to be evolved in the water. It is essential for the growth and reproduction in the organisms. The human body consists of about 70% water and it forms 70 to 90% part of the living cells. The water is a universal solvent. All the structural bio molecules interact with the help of water. Water provides liquid medium for all the vital activities. It helps in digestion, respiration and excretion. The life can’t survive without water.
