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Screw it, Google is more helpful than this.
Cell theory is the notion that living organisms are made up of cells, that cells are the fundamental unit of life and that they come about from the division of other cells.
Cell theory refers to the idea that cells are the basic unit of structure in every living thing. Development of this theory during the mid 17th century was made possible by advances in microscopy. This theory is one of the foundations of biology. The theory says that new cells are formed from other existing cells, and that the cell is a fundamental unit of structure, function and organization in all living organisms.