character: Professor John Rivers
topic: Effects of Metals on Aquatic Life
grade: 9
subject: Biology
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character: Dr. Lisa Waters
topic: Impacts of Heavy Metals on Freshwater Ecosystems
grade: 9
subject: Biology
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character: Mr. David Blue
topic: Toxic Effects of Metals on Fish Species
grade: 9
subject: Biology
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character: Ms. Emily Green
topic: Biological Indicators of Metal Pollution in Lakes
grade: 9
subject: Biology
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