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In late 1600s, an English scientist, Robert Hooke used a primitive microscope to look at a very tiny slice of cork. He noticed that the cork was made up of "a great many of little boxes" and he called those little boxes "cells".
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The
cell that Robert Hooke observed is made up of many tiny boxes.
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In 1675, a Dutch lensmaker, Atonie Van Leeuwenhoektook took a close look at the pond water through a better microscope that he made by himself. He saw that something was swimming around the pond water, and he called it "animalcules" which is now known as a singer-celled organism.
Then in 1830s, two German biologists, Mathias Schleiden and Theodor Scwann discovered that all living things are made up of similar unit-cells. Their discovery is known as the cell theory.
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Theodor Scwann is one of biologists who come up with cell theory
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