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Robert Hooke
Published "Micrographia". -
Antoni van Leeuwenhoek
Discovered bacteria and protozoa. -
Matthias Schleiden
Discovered all plant tissues are made of cells. -
Theodor Schwann
Published "Microscopic Investigations on the Accordance in the Structure and Growth of Plants and Animals" -
Rudolf Virchow
Proposed that all living cells must rise from pre-existing cells.