Galileo invented the simple optical microscope in 1610. this microscope had only one magnification that could be focused. this allowed for simple viewing smaller than the naked eye could percieve.
Using a newly invented Compound microscope, Robert Hooke was able to observe cork at a better magnification and coined the term cell from his observations.
Antony van Leeuwenhoek
in 1702 Antony van Leeuwenhoek discovered the organism class known as the Protist.
Cell theory first written
Theodor Schwann, Matthias Jakob Schleiden, and Rudolf Virchow are the three scientists credited for the development of cell theory. they concluded that cells made up all life and that cells come from preexisting cells.
Louis pasteur's experiments
in 1859 Louis Pasteur did experiments that showed that life could not spontaneously develop, he did this be doing experiments with boiled broth in swan neck flasks. since nothing grew on the borth when the flasks were closed it was determined that life could only come from life.
In 1859 Charles Darwin published his theory of evolution in his book the Orgin of Species. This book descibed his observations and his theories that he developed while on his trip aboard the H.M.S Beagle.
Gregor Mendel's Peas
In 1863 Gregor Mendel finished his experiments with pea plants and developed his laws of segregation and law of indapendent assortment.
invention of the electrom microscope.
Ernst Ruska invented the electron microscope in 1933, it allowed for the viewing of smaller materia with more detail than light microscopes.