character: Matthias Schleiden
topic: Role in the development of cell theory
grade: 9
subject: Biology
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character: Theodor Schwann
topic: Contribution to cell theory alongside Schleiden
grade: 9
subject: Biology
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character: Rudolf Virchow
topic: Extension of cell theory with 'Omnis cellula e cellula'
grade: 9
subject: Biology
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character: Robert Hooke
topic: Early microscope observations and introduction of the term 'cell'
grade: 9
subject: Biology
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