character: Teacher
topic: The role of veins in the circulatory system.
grade: 10
subject: Biology
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character: Student
topic: Differences between arteries and veins.
grade: 10
subject: Biology
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character: Doctor
topic: Common venous diseases and their impact on circulation.
grade: 10
subject: Biology
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character: Researcher
topic: The impact of veins on blood return to the heart.
grade: 10
subject: Biology
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