At what time the principle that a ll new cells arise exclusively from pre-existing cells and cannot self-assemble was formulated ?

Question

At what time the principle  that a ll new cells arise exclusively from pre-existing cells and cannot self-assemble was formulated ?

Answer

in parallel with other components of the cell theory

Answer

significantly later, at the beginning of 20-th century

Answer

before other components of the cell theory

Answer

later in 19-th century

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