The statement *omnis cellula e cellula* ('every cell arises from a pre-existing cell') was contributed by
ASchleiden
BSchwann
CVirchow
DLeeuwenhoek
Answer & Solution
Correct answer: C. Virchow
Rudolf Virchow added this third pillar to the cell theory in 1855. Schleiden and Schwann had observed that plants and animals are made of cells, but couldn't explain cell origin. Virchow's contribution settled the question and completed the theory.
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