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In biology, cell theory is the historic scientific theory, now universally accepted, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells. Cells are the basic unit of structure in all organisms and also the basic unit of ... All living organisms are composed of one or ...

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Answer: Basic unit of life. All living organisms are composed of one or two/more cells.

Example: Unicellar organisms made of one cell; bacteria. Humans, multicellar organisms; made of many cells.
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