character: Prof. David Johnson
topic: Effects of Water Pollution on Aquatic Ecosystems
grade: 9
subject: Biology
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character: Dr. Emily Carter
topic: Impact of Nutrient Runoff on Freshwater Life
grade: 9
subject: Biology
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character: Mr. Robert Smith
topic: Understanding Eutrophication in Lakes and Ponds
grade: 9
subject: Biology
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character: Ms. Sarah Lee
topic: The Role of Aquatic Plants in Water Quality
grade: 9
subject: Biology
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