Which sample is most likely obtained from river water upstream of all major cities?
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A student collected the following data when doing a biochemical oxygen demand test on four samples of water from a river. DISSOLVED OXYGEN CONCENTRATION : Sample I: Start 10 mg/L ----- End 7.0 mg/L Sample II: Start 9.0 mg/L ----- End 8.0 mg/L Sample III: Start 10 mg/L -----End 9.0 mg/L Sample IV: Start 6.0 mg/L ---- End 3.0 mg/L Based on the data, which sample is most likely obtained from river water upstream of all major cities? A. Sample I B. Sample II C. Sample III D. Sample IV
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Answer:
C
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