character: Microorganisms in Water Treatment
topic: Microbial Action in Water Purification
grade: 10
subject: Science
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character: Bacteria in Water
topic: Roles of Bacteria in the Environment
grade: 10
subject: Science
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character: Water Filtration Techniques
topic: Biological Filtration Processes
grade: 10
subject: Science
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character: Pathogens in Water
topic: Impact of Microorganisms on Human Health
grade: 10
subject: Science
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