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character: Lichens
topic: Ecological Importance of Lichens
grade: 9
subject: Biology
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character: Lichens
topic: Role in Ecosystems
grade: 9
subject: Biology
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character: Lichens
topic: Indicators of Environmental Health
grade: 9
subject: Biology
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character: Lichens
topic: Symbiotic Relationships in Nature
grade: 9
subject: Biology
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