Which theory suggests all living things are made up of a cell or cells? cell theory

organismal theory

cell theory is the answer without adding all the other words

The three scientists that contributed to the development of cell theory are Matthias Schleiden, Theodor Schwann, and Rudolf Virchow. A component of the cell theory is that all living things are composed of one or more cells. A component of the cell theory is that the cell is the basic unit of life.