Answer: cells come from pre-existing cells
The cell theory was proposed by Matthias Schleinden and Theodor Schwann during 1838–39. It states that all the living beings are composed of cells, they are the basic structural and functional unit of all the living organisms, and all cells have come from the previously existing cells.
On the basis of the above information, cells come from pre-existing cells is a part of the cell theory.
