Cells are the basic units of life as we know it here on Earth. There are organisms that are unicellular, which only have one cell in their structure, and those that are multicellular, which have more than one cell. In multicellular organisms, cells that do a similar function will band together to make what is know as a tissue. Likewise, similar tissues will band together to make an organ that does a specific function, such as the stomach. Organs that perform a similar overall function band together to form an organ system, such as the digestive system. Finally, organ systems that work together for the overall good health of an individual organism are called an organism. This series of levels is otherwise known as the hierarchy of cellular organization.
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