Question

Water is essential for sustenance of life. why

Answer 1

Water is the solvent that transports many essential molecules and other particles around the body. These include nutrients and waste products from the body's metabolic processes. Particles such as some ions and molecules need to be able to move around biological organisms.

Answer 2

Plants cannot be grown without water.
Water is needed to balance the temperature of the Earth.
Water is needed to transport important minerals within the body.