character: Mr. Tom Johnson
topic: Sources of Heavy Metals in Ocean Ecosystems
grade: 11
subject: Science
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character: Dr. Emily Carter
topic: Impact of Heavy Metals on Marine Life
grade: 11
subject: Science
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character: Professor Linda Wang
topic: Bioaccumulation of Heavy Metals in Marine Food Chains
grade: 11
subject: Science
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character: Researcher Alex Brown
topic: Methods for Reducing Heavy Metal Pollution in Oceans
grade: 11
subject: Science
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