character: Robert Hooke
topic: Early Observations and Discoveries Leading to Cell Theory
grade: 9
subject: Biology
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character: Anton van Leeuwenhoek
topic: The Improvement of Microscopy and Discoveries of Microorganisms
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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