Cell TheoryEvery organism is composed of one or more cells.The cell is the smallest unit having the properties of life.All cells come from pre-existing cells.Robert Hookein 1665 examined very thin slices of cork and saw aThe first to witness a live cell under a microscope was Antonie van Leeuwenhoekwho in 1674 described thevery thin slices of cork and saw a multitude of tiny pores that he remarked looked like the walled compartments (cells) a monk would live in. , who in 1674 described the algaeSpirogyra. In 1839, Schwann and Schleidensuggested that cells were the basic unit of life. In 1855, Rudolf Virchow concluded that all cells come from pre-existing cells
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