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Water is essential to life because all life forms depend on it.
Life began in the presence of water.
Water is the medium of life.
It is the most abundant compound found in all organisms. It varies from 65 to 89 % in different organisms.
Human tissues contain about 20 % water in bone cells and 85% in brain cells.
Almost all the reactions of a cell occur in the presence of water.
Hence the above points proves that why water is essential for life.
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