character: Ms. Emily Johnson
topic: Biological Indicators of Water Quality
grade: 12
subject: Chemistry
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character: Dr. Lisa Harrington
topic: Chemical Parameters in Water Testing
grade: 12
subject: Chemistry
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character: Mr. Tom Greenfield
topic: Effects of Pollution on Aquatic Ecosystems
grade: 12
subject: Chemistry
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character: Ms. Sarah Thompson
topic: Microorganisms as Water Quality Indicators
grade: 12
subject: Chemistry
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