Which scientist proposed that all cells arise from pre-existing cells?

The proposal that all cells arise from pre-existing cells is attributed to Rudolf Virchow. This concept is a key component of the cell theory, which fundamentally changed the understanding of biology. Virchow's assertion, encapsulated in the phrase "Omnis cellula e cellula," emphasizes that new cells cannot spontaneously generate but rather must come from the division of existing cells. This idea is crucial in the context of cell biology as it highlights the continuity of life and the mechanisms through which organisms grow, develop, and replicate.

Other scientists mentioned, such as Schleiden and Schwann, contributed to the formulation of the cell theory, particularly focusing on the idea that cells are the basic unit of life. Pasteur is known for his work in microbiology and disproving spontaneous generation, but he did not specifically propose the idea regarding the origin of cells as Virchow did. Understanding Virchow's contribution provides insight into the importance of cellular reproduction and inheritance in biological processes.