He discovered that the genetic code of an organism is found in its germ cells. And this explained how certain characteristics are passed on from generation to generation.
Germam Physician who stated that all living cells come from other living cells. His contribution to cell theory was the idea that pathological reactions were cell reacting.
Anton Leeuwenhoek a fabric merchant that considered himself an amateur scientist. He spend his time looking at different organism on microscope. He was the first man to observed a living cell under a microscope. He called these "Animalcules".
Robert Hooke was the first to observed the presence of cells. He looked at very thin slices of cork through a microscope and discovered that their was tiny pores and decided to call the Cells.
Zacharias and Hans Jansen invented the first compound microscope. Their microscope had multiple lenses and that is why it is called a compound microscope.