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1590's Hans and Zacharias Jassen invented the compound microscope ,
In 1665 Robert Hooke discovered the basic unit of life as the term "cell" ,
In 1676 Anton van Leeuwenhoek discovered bacteria ,
In 1838 Matthias Schleiden discovered/stated plant tissues were composed of cells This scientist directly contributed to the cell theory. .
In 1839 Theodor Schwann demonstrated that animal tissues were made up of cells and concluded that all tissues are made up of cells. This scientist directly contributed to the cell theory because the things he proved laid the foundations for the cell theory. ,
In 1831 Robert Brown discovers the nucleus of the cell. ,
In 1857 Rudolph Virchow strongly supports that cells come from preexisting cells. This scientist directly contibusted to the ell theory because of was he strongly supported. .
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