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← GeographyWhich impact directly decreases nearshore oxygen levels during coastal upwelling?
A)Nutrient-driven plankton bloom respiration✓
B)Increased deep-water currents mixing.
C)Shallower depths increasing water.
D)Reduced photosynthetic productivity offshore
💡 Explanation
Coastal upwelling brings nutrient which triggers a phytoplankton bloom; subsequent respiration during the bloom depletes oxygen via biological pump action. Therefore, bloom respiration lowers oxygen rather than offshore productivity decrease or current-driven mixing.
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