character: Professor John Smith
topic: Bioaccumulation of Heavy Metals in Food Chains
grade: 12
subject: Chemistry
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character: Dr. Emily Johnson
topic: Effects of Heavy Metals on Aquatic Ecosystems
grade: 12
subject: Chemistry
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character: Professor Alan Thompson
topic: Toxicity of Heavy Metals in Human Health
grade: 12
subject: Chemistry
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character: Dr. Sarah Lewis
topic: Biomagnification and Its Environmental Impact
grade: 12
subject: Chemistry
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