Water is an essential element of life, without it life simply wouldn't exist. The overall mass of a cell is made up of between 70-90% water alone. This means that we are made from approximately 80% water by mass and some soft bodied creatures such as jellyfish are made of up to 96% water. Water also provides an environment for organisms to live in, 75% of the earth is covered in water. Water molecules are made up of 2 hydrogen atoms and one oxygen atom, H2O. The hydrogen and oxygen atoms are bonded covalently as shown in the...
compounds

Germination of seeds-swelling and breaking open of the testa and further development

The functions of water that are biologically important for animals are:

Transport

Osmoregulation

Cooling by evaporation, such as sweating, panting

Lubrication, as in joints

Support-hydrostatic skeleton

Protection, for example lachrymal fluid, mucus

Migration in ocean currents

In conclusion water"s unique properties make it perhaps the most biologically important substance on the planet. No other substance shares similar properties to water and in the way that one single molecule can possess such varied and essential characteristics.