character: Robert Hooke
topic: Discovery of cells and contribution to cell theory
grade: 9
subject: Biology
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character: Anton van Leeuwenhoek
topic: Development of microscopy and observation of living cells
grade: 9
subject: Biology
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character: Matthias Schleiden
topic: Contribution to cell theory: plant cells
grade: 9
subject: Biology
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character: Theodor Schwann
topic: Contribution to cell theory: animal cells
grade: 9
subject: Biology
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