Why Is Water So Important To Human Life?

Because it'sthe recourse of life

1. Most metabolic activities take place in a water medium at the cellular level.
2. Water is good solvent. Most metabolites are soluble in water.
3. Water is essential for the process of digestion.
4. Substances are transported in the body in dissolved form. Thus, water helps in internal  transport.
5. Water helps in expelling out the metabolic waste from the body.
6. Water helps in maintaining body temperature.

Because with out water u couldn't survive .

The existence of humanity itself depends upon water so certainly we can't imagine human life without water. There are various reasons that can be cited in favour of the importance of water for human life.
      
We all know that all the ancient civilisations were appeared near one or other river and we can cite the names of Egyptian civilisation, Mesopotamian civilisation and Indus Valley civilisation. These civilisations appeared on the banks of Nile, Dajla and Farat and Indus rivers respectively. And there is a pragmatic reason behind their appearance near the rivers. People can plant their crops that can be irrigated with the help of water and only then food comes to feed the population.
      
The transportation is also played a vital role in developing these civilisations near rivers because in the ancient times there was no motor vehicle and goods were being transported on boats.
       
Even when we talk in terms of science, water consists of more than seventy-five per cent of our body mass so certainly it is vital for human beings to function in the proper way.