who expanded cell theory? what does it proposed?
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cell theory was expanded by Virchow in 1855 by suggesting that all cells arise from pre -existing cells .
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Virchow is the scientist who expanded the cell theory in 1855 which suggests that all of the cells in an organisms arise from a single cell. Now we know that this is true as the 1st stage of fertilization the cell is the single and then it start to multiply and grow to make up the new individual and give various stages like morula, blastula and neurola.
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