character: Professor Brown
topic: Natural Alternatives to Chemical Preservatives
grade: 11
subject: Chemistry
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character: Dr. Green
topic: Exploring Natural Additives in Food Chemistry
grade: 11
subject: Chemistry
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character: Ms. Lee
topic: The Impact of Preservatives on Health and Environment
grade: 11
subject: Chemistry
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character: Mr. Smith
topic: Chemical vs. Natural Preservatives: A Comparative Study
grade: 11
subject: Chemistry
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