Yet when water evaporates, it no longer forms polymers. This allows it to disperse in the atmosphere so it doesn't stifle life by lying on the earth's surface as an unbreathable gas. No other substance has this property. Water is also a universal solvent, dissolving the necessary solid chemicals so they can circulate in the bloodstream, plant sap, and living cells. All other liquids which can dissolve a comparable number of chemicals are highly corrosive and deadly to living things.
Water is unusual in being able to absorb a large amount of heat for a given change in temperature.
As a result, it moderates the climate of the earth and helps stabilize the body temperature of animals. Like few other substances, it expands rather than contracts on freezing. Truly water is a most amazing substance. The earth's environment is unique in the solar system and at least very rare in our galaxy. The temperature varies substantially from pole to equator, summer to winter, and from the Dead Sea to Mt. Everest.