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Which outcome occurs when dissolved molecular oxygen concentration depletes within a marine sediment layer?

A)Anaerobic respiration rate increases
B)Ammonia oxidation accelerates rapidly
C)Nitrification processes dominate thoroughly
D)Phosphate precipitation reactions accelerate

💡 Explanation

Anaerobic respiration increases because the *electron acceptor availability* shifts from oxygen to substances like nitrates; therefore, anaerobic pathways become dominant, rather than the aerobic oxidation processes which are inhibited by hypoxia.

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