Here's why:
* Universal Solvent: Water dissolves a wide range of substances, allowing for chemical reactions and transport within living organisms.
* High Heat Capacity: Water absorbs a lot of heat before its temperature rises significantly, helping to regulate internal temperatures in organisms and moderate Earth's climate.
* High Heat of Vaporization: Water requires a lot of energy to evaporate, allowing organisms to cool down through sweating or transpiration.
* Cohesion and Adhesion: Water molecules stick together (cohesion) and to other surfaces (adhesion), allowing for efficient transport in plants and blood flow in animals.
* Density: Water is denser as a liquid than a solid, allowing ice to float and insulate aquatic life.
So, to answer your question, there is no property of water that is not important to life on Earth.