character: Freshwater Ecosystems
topic: Differences between Freshwater and Marine Ecosystems
grade: 9
subject: Biology
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character: Marine Ecosystems
topic: Salinity and its effects on organism distribution
grade: 9
subject: Biology
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character: Wetlands
topic: Importance of Freshwater Ecosystems
grade: 9
subject: Biology
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character: Biodiversity
topic: Comparison of species in Freshwater vs. Marine environments
grade: 9
subject: Biology
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