Later in that century

Later in that century - concluded that all animals are also...

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Later in that century, Anton Van Leeuwenhoek, a Dutch merchant,  made further observations of plant, animal, and microorganism cells.  In 1838, the German botanist Matthias Schleiden proposed that all  plants are composed of cells.  A   year   later,   his   colleague,   the   anatomist   Theodore   Schwann, 
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Unformatted text preview: concluded that all animals are also composed of cells. In 1858, the biologist Rudolf Virchow proposed that all living things are made of cells and that all cells arise from preexisting cells. These premises have come down to us as the cell theory....
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