How do water’s properties help sustain life on earth?

Composition
Water is composed of two hydrogen atoms and one oxygen atom and is expressed as H20. When hydrogen and oxygen bond in this combination, a single molecule of water is created. The composition of a water molecule is what gives it its unique properties and allows it to interact with other molecules (water or otherwise) in meaningful ways.
Polarity
A water molecule’s structure gives it polarity, the special electrical charge it needs to attract other atoms. The hydrogen in the water is positively charged, while the oxygen is negatively charged, giving the molecule properties like a magnet. Just as the negative end of a magnet will attract positive charges (and vice-versa), the negative charge of the oxygen will attract positively charged atoms. Similarly, the positive charge of the hydrogen will attract negatively charged atoms. When other polar substances are put in water, the water molecules’ unique properties will cause the new substance to dissolve within the water as the molecules are attracted to each other like magnets. This is incredibly important for life, as water can dissolve, carry, and spread the chemicals, minerals, and nutrients necessary to support life.
Surface Tension
If you have ever seen raindrops or beads of water dripping down the side of a cup, you have witnessed water’s surface tension. This, also a result of hydrogen/oxygen polarity, causes molecules to stick together as they are attracted to one another. This gives water a skin that can support light objects and causes water to clump together in drops instead of spreading out. When water moves through plant roots and blood vessels, this high surface tension and polarity causes molecules to drag other molecules along with it.
States of Matter
All matter in the universe can exist in three natural states—solid, liquid, or gas. On Earth, water is the only substance that naturally appears in all three (ice, liquid water, or vapor). Any other substance could be made to appear in different states, but it must be artificially heated or cooled. The natural conditions on Earth already give us water in all three states of matter. Vapor is present in our atmosphere, liquid is present in our rivers, lakes, and oceans, and ice is present in extremely cold environments. Interestingly, most liquids will slow down and contract when they cool, as they lose their ability to resist attraction to each other. This means most frozen substances will be denser than they were as liquids, and the molecules move closer together. Water, on the other hand, expands into a very open crystalline structure when it freezes. This makes ice less dense than water, allowing it to float, and preventing lakes and rivers from freezing solid and killing any life inside them.
Summary
These basic properties are vital to the survival of life. Water’s polarity and surface tension makes it a powerful solvent for sugars, amino acids, and proteins; water can easily hold and transport substances necessary for life within and outside of living things. While capable of existing in multiple states naturally, the points at which water freezes and boils are so low and high, respectively, that it can act as an effective temperature buffer. Also, much of life has evolved to live within water, and by many suggestions, life itself began in water. If water froze similarly to other substances, then rivers and lakes would turn completely solid in cold temperatures; life as we know it would not be able to survive.
https://learning-center.homesciencetools.com/article/properties-water-science-lesson/

https://www.rsc.org/Education/Teachers/Resources/cfb/water.htm