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Which outcome occurs when coastal upwelling declines within gyres?

A)Reduced primary productivity by phytoplankton
B)Increased carbon sequestration in sediments
C)Accelerated thermohaline circulation rates
D)Enhanced deep-sea methane hydrate formation

💡 Explanation

Reduced upwelling leads to less nutrient availability; reduced nutrient supply decreases phytoplankton growth because nutrient Limitation inhibits photosynthesis—rather than enhances deep sediment deposition or circulation, and methane production requires different triggers, creating changes in the system.

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