Anton Van Leeowenhook heard about the microscope that Zacharias Janssen made & decided to make his own. Then he made a discorvery that bacteria existed.
Robert Hooke came up with the term "cells" because one day he was looking at a piece of cork & it reminded him of little chambers.
The cell theory was discovered by Mat thias scheiden & Theodor schwann. They came to the conclusion that plants were all made of cells and animals too! They argued because one said that cells formed by themselves & the other said cells formed from other existing cells.
Rudolph Virchor did/ "borrowed" research and then came to the conclusion that cells were created by more cells .