character: Dr. Emily White
topic: Impact of Population Density on Urban Resources
grade: 9
subject: Social Studies
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character: Dr. Alan Johnson
topic: Urbanization and Resource Management
grade: 9
subject: Social Studies
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character: Ms. Sarah Lee
topic: Effects of High Population Density on City Infrastructure
grade: 9
subject: Social Studies
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character: Professor Michael Green
topic: Sustainable Development in Highly Populated Areas
grade: 9
subject: Social Studies
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