1.1. Antoni van Leeuwenhoek (1632-1723), created the microscope.
1.2. Robert Hooke (1635-1703), found bacteria, or “little animals”.
1.3. Matthias Jakob Schleiden (1804-1881), who looked at numerous plant samples. Schleiden was the first to recognize that all plants, and all the different parts of plants, are composed of cells
1.4. Theodore Schwann (1810- 1882), published "Microscopic Investigations on the Accordance in the Structure and Growth of Plants and Animals," which included the first statement of the cell theory: All living things are made up of cells.
1.5. Rudolf Virchow (1821- 1902), proposed that all living cells must rise from pre-existing cells
1.6. Louis Pasteur (1822- 1895), created a experiment that both firmly established the cell theory beyond doubt and solidified the basic steps of the modern scientific method.
2. Microscope
3. Three main ideas
3.1. All organisms are made of cells
3.2. Cells are alive and the basic living units of organization in all organisms.
