character: Ms. Waters
topic: Impact of Human Activity on Nitrogen Levels
grade: 11
subject: Biology
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character: Mr. Johnson
topic: Effects of Agricultural Practices on Water Quality
grade: 11
subject: Biology
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character: Dr. Smith
topic: Nitrogen Cycle and Its Disruption by Pollution
grade: 11
subject: Biology
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character: Ms. Brown
topic: The Role of Fertilizers in Ecosystem Changes
grade: 11
subject: Biology
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