character: Rudolf Virchow
topic: Cell Theory Expansion
grade: 9
subject: Biology
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character: Theodor Schwann
topic: Cell Theory Contributions
grade: 9
subject: Biology
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character: Matthias Schleiden
topic: Plant Cell Research
grade: 9
subject: Biology
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character: Robert Hooke
topic: Discovery of Cells
grade: 9
subject: Biology
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