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An organism is any individual entity that embodies the properties of life. It is a synonym for "life form". Organisms are classified by taxonomy into groups such as multicellular animals, plants, and fungi; or unicellular microorganisms such as protists, bacteria, and archaea.
Some living things, like the bacteria, consist of just one cell. They are called single-celled organisms.
A living organism is composed of cells. The cells divide and the body of the organisms show growth due to the increase in the number of cells. A tree is a living organism and shows the process of growth.