character: Eco Chemist
topic: Application of Indicators in Nature
grade: 9
subject: Chemistry
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character: Environmental Scientist
topic: Using pH indicators in soil analysis
grade: 9
subject: Chemistry
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character: Biologist
topic: Natural indicators from plant extracts
grade: 9
subject: Chemistry
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character: Ecologist
topic: Role of indicators in assessing ecosystem health
grade: 9
subject: Chemistry
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