Answer:
one of the first persons to observe cells - Robert Hooke
Discovered protozoa -Leeuwenhoek
Concluded that all plants are made up of cells - Matthias Jakob Schleiden
Extension of cell theory to animals - Schwann
Proposed that all cells come from other cells- Rudolf Virchow
Explanation:
The cell theory lays the basis of biology. The discoveries of many scientists led to the formation of the cell theory. For example, the discovery of the microscope enabled to view cells on the basis of which the cell theory was formed by Schleiden and Schwann.
