I found cells, and called them this because they looked like individual compartments.
I discovered the nucleus of cells by looking at plant cells.
I discovered that all plants are made of cells.
I defined the basic unit of all animal structures as the cell.
I discovered that the origin of all cells was from the division of preexisting cells.
The Parts of the Cell Theory
We discovered the first two parts of the cell theory; the first one being that all living things are made of cells, and the second being that cells are the basic unit of structure and function in living things.
I am credited with discovering the third part of the cell theory; that all cells come from preexisting cells.