Jansen invented the compound optical lens. His invention made it easier and more practical to look at microscopic things . Scientists were also lead to the rejection of cell theory because of his invention.
Hooke discovered cells while looking at a cork. He helped lead to the rejection of spontaneous generations by finding that living things come from other living things.
Anton Van Leewenhoek
Leewenhoek discovered single cell organisms “ Animalcules”. He also proved organisms came from other living things which rejected spontaneous generation.
Schleiden discovered that plant tissue was made of cells. His contribution to the rejection of spontaneous generation was that he proved that all living need cells to survive.
Schwann discovered that animal tissue was made of cells. He also confirmed that organisms come from living things which contributed to the rejection of spontaneous generation.
Virchow discovered that cells come from pre existing cells this was also his part in the rejection of spontaneous generation.