Antonie van Leeuwenhoek was known for which discovery in late 17th century?

🔑Key Points:
-Leeuwenhoek is universally acknowledged as the father of microbiology. 
-He discovered both protists and bacteria.
-More than being the first to see this unimagined world of 'animalcules', he was the first even to think of looking—certainly, the first with the power to see.
-Antonie van Leeuwenhoek used single-lens microscopes, which he made, to make the first observations of bacteria and protozoa. 

🔴Additional Information:
-The key properties of a stem cell were first defined by Ernest McCulloch and James Till at the University of Toronto and the Ontario Cancer Institute in the early 1960s.​ 
-The ATP molecule was discovered in the year 1929 by German chemist Karl Lohmann.
-Robert Brown discovered the nucleus of the cell in 1804.