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life structure and function

1665: robert hooke discovers cells while examining thin slices of cork under a microscope

1674: Anton vanLeeuwenhoek observs living cells under a microscope and names the organisms animalcules

1831: the nucleus is given its name by Robert Brown

1858: rudolf virchow concludes that all cells come from

1875: Walther Flemming introduces the term mitosis and notes that chromosomes split longitudinally during this process

1953: James Watson and Francis Crick develop the double-helix model of dna

1839: Theodore Schawann publishes a book suggesting that the cell is the basic unit of life