New cells generate from pre-existing cells. Rudolf Virchow (1985) first explained that cells divide and new cells are formed from pre-existing cells (omnis cellula-e cellula). He modified the hypothesis of Schleiden and Schwann to give cell theory a final shape. Cell theory now is understood as:
All living organisms are composed of cells and the product of cells.
All cells arise from pre-existing cells.
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(c) pre-existing cells (d) abiotic materials
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New cells are generated from
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