Which scientist's statement complemented the cell theory in 1855?

The statement by Rudolf Virchow in 1855 that complemented the cell theory was significant because he proposed the concept that "Omnis cellula e cellula," which means "all cells come from pre-existing cells." This assertion supported the existing ideas of cell theory by emphasizing the cellular basis of life and reinforcing the notion that new cells are produced from the division of existing cells. Virchow's contribution was crucial in understanding cell proliferation and the continuity of life, which established a foundational principle in biology.

In context, Gregor Mendel focused on inheritance and genetics, which, while important, did not directly relate to cell theory at that time. Charles Darwin's work dealt primarily with evolution and natural selection, not the cellular basis of life. Louis Pasteur is best known for his advancements in microbiology and vaccines, particularly in addressing the roles of germs in disease, which while interrelated with cell theory, was not a direct complement to it in the same manner as Virchow's work.