character: Robert Hooke
topic: Discovery of Cells
grade: 9
subject: Biology
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character: Anton van Leeuwenhoek
topic: Early Microscopic Discoveries
grade: 9
subject: Biology
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character: Matthias Schleiden
topic: Cell Theory Contributions
grade: 9
subject: Biology
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character: Theodor Schwann
topic: Cell Theory Development
grade: 9
subject: Biology
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