character: Ms. Adams
topic: Natural Alternatives to Chemical Preservatives
grade: 11
subject: Chemistry
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character: Dr. Smith
topic: Chemistry of Natural Preservatives
grade: 11
subject: Chemistry
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character: Mr. Johnson
topic: Comparative Study of Natural vs. Chemical Preservatives
grade: 11
subject: Chemistry
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character: Ms. Lee
topic: Impact of Preservatives on Food Safety
grade: 11
subject: Chemistry
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