character: Plant Cells
topic: Composition of Cell Walls
grade: 9
subject: Science
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character: Cellulose
topic: Key Material in Plant Cell Walls
grade: 9
subject: Science
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character: Lignin
topic: Structural Component in Cell Walls
grade: 9
subject: Science
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character: Hemicellulose
topic: Supportive Material in Cell Walls
grade: 9
subject: Science
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