character: Tom Fisher
topic: Phosphorus Cycle and its Impact on Water Systems
grade: 9
subject: Biology
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character: Dr. Jane Smith
topic: Nutrient Pollution and Aquatic Ecosystems
grade: 9
subject: Biology
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character: Professor Mark Johnson
topic: Effects of Phosphorus on Freshwater Algae
grade: 9
subject: Biology
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character: Mrs. Linda Green
topic: Human Activities and the Phosphorus Cycle
grade: 9
subject: Biology
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