1. The Cell Theory 1.All living things are composed of cells. 2.Cells are the basic units of structure and function in living things. 3.All cells are produced from other cells.

2. Zacharias Janssen - 1590 Invented the first compound microscope May have been helped by his father

3. Robert Hooke - 1665 Looked at cork and called the square rooms “cells”

4. Anton Van Leeuwenhoek - 1680 Looked at pond water and saw “animalcules” Looked at his teeth scrapings and discovered bacteria

5. Matthias Schleiden and Theodor Schwann Schleiden 1838 (studied plants) Schwann 1839 (studied animals) B Both men concluded that living things were made of cells.

6. Rudolf Virchow - 1855 Concluded that all cells come from existing cells

7. Louis Pasteur - 1862 Disproved spontaneous generation Proved that all life comes from life