Dutch Biologist: contributed to the telescope invention. Discovered tiny organisms in pond water. Found by looking through a microscope he invented
Accidental discovery of tiny chambers/rooms in a cork. Thought to be living organisms, but they were nonliving.
Discovered dark structure in the center of the cell. Found out it was the nucleus.
Created first part of cell theory; "all plants are made of cells"
Contributed to the making of the cell theory; stated "all animals are made of cells."
German Physician also contributed to the making of the cell theory; stated "All cells arise from the division of pre-existing cells."