Question

Who expanded the cell theory and how

Answer 1

cell theory was expanded by Virchow in 1855 by suggesting that all cells arise from pre -existing cells .


also, Scleidon and Schwann expanded the cell theory which was useful in the later years.

Answer 2

On the basis German zoologist Theodore Schwann and German botanist M. Schleiden proposed a cell theory in 1838-39.