Solute - A solute is the part that is dissolved in a solution. Sugar, common salt and caustic soda are examples of a solute.

Solvent - A solvent is the part that does the dissolving in a solution. An example of a common solvent is water.

Solution - Solutions are defined as homogeneous mixtures. As well as water, solutions include a wide range of artificial and naturally occurring systems such as blood, stomach acid, sap in plants, and beverages such as coffee and lemonade.

Explain the importance of water as a biological solvent:

Water plays a very important role on Earth acting as a biological solvent for many solutes. This is a very important property of water in the maintenance of life. To a certain extent, water is able to dissolve such things as oxygen, various salts and nutrients, making water very significant towards animal and plant life...