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Increased algae growth affects Roman aqueducts because of silting. Which mechanism caused a cascade toward purification failure?

A)Biofilm formation obstructs flow.
B)Increased pH accelerates scale.
C)Eutrophication boosts bioload.
D)Thermal sinking increases mixing.

💡 Explanation

Eutrophication increases nutrient levels, therefore bioload spikes because photosynthetic waste deoxygenates water, rather than other mechanisms relating to thermal properties. The deoxygenation reduces purification by sedimentation.

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