AP BIOLOGY

Detailed explanation-1: -Antonie van Leeuwenhoek used single-lens microscopes, which he made, to make the first observations of bacteria and protozoa.

Detailed explanation-2: -Anton Van Leeuwenhoek was the first person to observe living cells. In 1675, he saw a single celled organism in a drop of pond water. These living things were microscopic and could not be seen without a microscope. By 1800, better microscopes were being made.

Detailed explanation-3: -Leeuwenhoek is universally acknowledged as the father of microbiology. He discovered both protists and bacteria [1]. 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.

Detailed explanation-4: -Thus, although Leeuwenhoek is sometimes called “the inventor of the microscope, ” he was no such thing. However, because of various technical difficulties in building them, early compound microscopes were not practical for magnifying objects more than about twenty or thirty times natural size.