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← GeographyWhich outcome occurs when overfishing collapses keystone plankton populations?
A)Reduced coastal upwelling's productivity✓
B)Increased thermohaline stratification globally
C)Amplified equatorial ocean current speeds
D)Decreased atmospheric carbon sequestration rates
💡 Explanation
Nutrient delivery through upwelling is normally enhanced by plankton which increases local stability; collapses then weaken the Biogeochemical Pump. This reduces productivity locally because plankton drive this process, rather than altering stratification significantly.
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