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← Nature & AnimalsWhich effect results when increased phosphorus limits nitrogen fixation in oceans?
A)Reduced cyanobacteria photosynthetic efficiency✓
B)Enhanced diatom silica shell formation
C)Increased oceanic carbon sequestration
D)Expanded deep-sea chemosynthetic ecosystems
💡 Explanation
Limited phosphorus reduces ATP production needed for nitrogenase enzyme activity during nitrogen fixation; therefore, cyanobacteria photosynthesis decreases because of insufficient fixed nitrogen availability, rather than increased diatom growth or carbon sequestration.
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