character: Khan Academy
topic: Introduction to Cell Membranes
grade: 9
subject: Biology
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character: Khan Academy
topic: Structure and Function of Cell Membranes
grade: 9
subject: Biology
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character: Khan Academy
topic: Transport Across Cell Membranes
grade: 9
subject: Biology
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character: Khan Academy
topic: Membrane Structure and Function
grade: 9
subject: Biology
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