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Analyzing Local Water Quality Data
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Grade Level
Grade 7
7.65 Analyzing Local Water Quality Data
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Which interpretation best indicates the stream’s health based on these data?
A
The stream is definitely healthiest because oxygen is highest in the afternoon.
B
Even though afternoon oxygen is high, the very low pre‑dawn oxygen suggests an algae-driven oxygen crash, which is stressful for stream life.
C
The stream must be healthy because nitrates and phosphates always increase oxygen at night.
D
The data prove the stream is healthy because oxygen never changes during a day.
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