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A town monitors a lake after heavy spring rains. Nitrate levels rise from 1 mg/L to 8 mg/L, algae cover much of the surface two weeks later, and dissolved oxygen falls overnight before a fish kill. Which explanation best links these observations?
Nitrates directly poison fish gills before algae can affect the ecosystem.
Nutrient enrichment caused an algal bloom, and respiration plus decomposition lowered dissolved oxygen.
The rain diluted oxygen because freshwater cannot hold oxygen after storms.
The algae released oxygen all night, so the fish kill must be unrelated to the bloom.
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