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← GeographyWhich ecological outcome occurs when deep ocean upwelling declines?
A)Plankton blooms decrease considerably✓
B)Thermocline layer becomes significantly thinner
C)Saltwater intrusion affects coastal aquifers
D)Submarine volcanic activity rapidly diminishes
💡 Explanation
Reduced upwelling diminishes nutrient access to aquatic ecosystems, because currents transport essential minerals; `nutrient limitation` impedes plankton reproduction; therefore, plankton decreases rather than increases, assuming the existing food web depended on upwelling.
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