The account that organisms are organized from biological cells and that cellular continuity is fundamental to their growth and reproduction. Its nineteenth-century formulation developed alongside changing accounts of cell division.
Its familiar modern formulation combines three claims: organisms consist of one or more cells, the cell is a basic unit of living organization, and new cells arise through pre-existing cellular lineages. The last claim concerns continuity of present-day life and does not by itself explain the earliest origin of cells. [ref]
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