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6-3 What is deforestation? 6-1 What services do ecosystems provide for us? 6-2 What is smog? 6-3 What is a pollutant? 6-1 What is the difference between a threatened, endangered, and extinct species? 6-3 What is biodiversity? 6-3 How does biodiversity relate to the health of an ecosystem? What are some ways human activity has reduced biodiversity? ................
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