character: Mr. Johnson
topic: Comparative Study of Natural vs. Chemical Preservatives
grade: 11
subject: Chemistry
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character: Ms. Smith
topic: Impact of Preservatives on Food Quality
grade: 11
subject: Chemistry
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character: Dr. Lee
topic: Chemical Reactions of Common Food Preservatives
grade: 11
subject: Chemistry
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character: Professor Brown
topic: Natural Alternatives to Chemical Preservatives
grade: 11
subject: Chemistry
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