character: Dr. Emily Zhang
topic: Microbial Diversity in Varying Soil pH Levels
grade: 12
subject: Chemistry
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character: Professor John Smith
topic: Impact of Soil pH on Nutrient Availability
grade: 12
subject: Chemistry
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character: Dr. Sarah Liu
topic: Microbial Ecological Functions in Different pH Environments
grade: 12
subject: Chemistry
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character: Dr. Michael Roberts
topic: Soil Chemistry and Microbial Communities
grade: 12
subject: Chemistry
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