Robert Hooke: One of the first to build a compound microscope to observe cells. In 1663 observed the structure of a thin slice of cork, and found that it was made up of cells.
Anton Van Leeuwenhoek: At the same time that Hooke made his discovery, he found a variety of one-celled organisms.
1838 Schleiden concluded that all the plants are made of cells.
1839 Schwann concluded that all the animals are made of cells.
1855 Virchow proposed “all cells come from cells”.
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