What Would Explain the Poor Condition for Biological Productivity in the Open

question 59

Multiple Choice

What would explain the poor condition for biological productivity in the open tropical ocean?

• A) Converging currents produce downwelling, thus carrying nutrients to the deep ocean.
• B) Gyres contain pollution and decaying organisms that use up available nutrients.
• C) Upwelling delivers seafloor sediment to the surface, thus blocking necessary sunlight for photosynthesis.
• D) Strong layering isolates deep, nutrient-rich water from the sunlit ocean surface.

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