character: Rudolf Virchow
topic: Cell Theory and Its Expansion
grade: 9
subject: Biology
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character: Robert Hooke
topic: Early Contributions to Cell Theory
grade: 9
subject: Biology
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character: Anton van Leeuwenhoek
topic: Discovery of Microorganisms
grade: 9
subject: Biology
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character: Theodor Schwann
topic: Development of the Cell Doctrine
grade: 9
subject: Biology
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