As the most abundant inorganic substance found in living matter, water is considered to be the factor which holds the key for the prevalence of life on Earth. Though water is essential for living beings, there are several requirements for water to fulfill to allow organisms to prevail. First of all comes the physical state of it. No being could live in solid ice. No being could live in water vapor either. So it is the liquid water that does all the magic. The following chart would give you a clear understanding of the importance of water for living beings :