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← HistoryWhich outcome regularly occurred in pre-Columbian chinampa agriculture when insufficient dredging was performed around the raised beds?
A)Increased anaerobic decomposition of organic matter✓
B)Decreased nutrient mixing from bottom sediment
C)Diminshed soil salinity modulation efficiency
D)Reduced thermal buffering against frost
💡 Explanation
Increased anaerobic decomposition occurs because without dredging, stagnant water limits oxygen diffusion in the soil, causing anaerobic bacteria to dominate organic matter breakdown, therefore releasing methane and other problematic decomposition products, rather than promoting aerobic processes.
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