Answer:
A Prussian physician Rudolph Virchow proposed in 1855 that all cells are produced from the same division of existing cells. The observations and conclusions of these scientists and others are summarized as the cell theory.
The cell theory is one of the fundamental ideas of modern biology
and includes three principles.
1. All living organisms are composed of one or more cells.
2. Cells are the basic unit of cell structure and organization of all living organisms.
3. Cells arise only from previously existing cells, with cells passing copies of their genetic material on to their daughter cells.
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