Answer:
Matthias Schleiden, Theodor Schwann, and Rudolf Virchow are the contributors of cell theory.
Step-by-step explanation:
Matthias Schleiden and Theodor Schwann formulated the cell theory in 1839 after studying tissues. They said that cell is the basic unit of life, new cells are formed from the old cells through cell division and all living things are made up of one or more cells. Matthias Schleiden, Theodor Schwann, and Rudolf Virchow are the three scientists who made important contribution to cell theory.