character: Darwin
topic: Vertebrate Evolution
grade: 9
subject: Biology
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character: Linnaeus
topic: Comparative Anatomy of Chordates
grade: 9
subject: Biology
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character: Gregory
topic: Evolutionary Relationships Among Vertebrates
grade: 9
subject: Biology
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character: Haeckel
topic: Embryonic Development in Chordates
grade: 9
subject: Biology
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