character: Professor Cellini
topic: Cell Theory and Organisms
grade: 9
subject: Science
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character: Robert Hooke
topic: Discovery of Cells
grade: 9
subject: Science
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character: Theodore Schwann
topic: Schwann's Contributions to Cell Theory
grade: 9
subject: Science
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character: Rudolf Virchow
topic: Opportunities in Cell Theory
grade: 9
subject: Science
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