This video from Kentucky's Last Great Places shows how the Green River has remained unusually clean and why it is home to several endangered aquatic species. [4:13]

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Concepts

natural selection, rivers

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Additional Tags

biological evolution, earth system, green river, natural changes, kentucky river, pbs learningmedia: unique species of kentucky's green river, teachers' domain, wgbh

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Classroom Considerations

Knovation Readability Score: 5 (1 low difficulty, 5 high difficulty)

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