character: Matthias Schleiden
topic: Collaborations in Developing Cell Theory
grade: 9
subject: Biology
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character: Theodor Schwann
topic: Contribution to Cell Theory alongside Schleiden
grade: 9
subject: Biology
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character: Rudolf Virchow
topic: Extension of Cell Theory with 'Omnis cellula e cellula'
grade: 9
subject: Biology
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character: Robert Hooke
topic: Early Observations and Discoveries Leading to Cell Theory
grade: 9
subject: Biology
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