Answer
The three statements that make up the cell theory are:
(1) Every living thing is composed of cells.
(2) The structure and function of all living things are cells.
(3) Cells arise from existing cells.
Work Step by Step
Because of the work of many scientists, the cell theory came into existence. Schleiden and Schwann discovered that both plants and animals are made up of cells, giving rise to the idea that all organisms are made up of cells. Virchow confirmed that cells can only arise from existing cells.
