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character: Mr. David Smith
topic: Examples of Keystone Species and Their Impact on Ecosystems
grade: 9
subject: Biology
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character: Mr. David Smith
topic: Role of Keystone Species in Biodiversity
grade: 9
subject: Biology
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character: Mr. David Smith
topic: How Keystone Species Maintain Ecosystem Balance
grade: 9
subject: Biology
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character: Mr. David Smith
topic: Case Studies of Keystone Species in Various Ecosystems
grade: 9
subject: Biology
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