Mammals are typically 65% water.
It is used to break down complex molecules by hydrolysis. Produced in condensation reactions. Major material in photosynthesis and reactions occur in aqueous medium- these all equates to the importance of water in metabolism.
Water dissolves other substances like gas, wastes like ammonia and urea, inorganic ions and enzymes. This makes water a suitable solvent.
Its evaporation cools organisms down to control their temp, not easily compressed to provides support, it is transparent and so aquatic plants can photosynthesise and light rays can penetrate.
Inorganic ions occur in cytoplasm of cells like haemoglobin transports o2, phosphate ions form structural role in DNA, hydrogen ions in determining the pH of solutions.
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