character: Matthias Schleiden
topic: Contributions to Cell Theory
grade: 9
subject: Biology
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character: Robert Hooke
topic: Microscopic Discoveries and Cell Theory
grade: 9
subject: Biology
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character: Theodor Schwann
topic: Collaborations with Schleiden in Cell Theory
grade: 9
subject: Biology
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character: Rudolf Virchow
topic: Cell Theory Expansion
grade: 9
subject: Biology
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