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← HistoryWhich agricultural disadvantage becomes limiting on pre-Columbian steep terrace farms in the Andes after sustained rainfall?
A)Nutrient depletion through dissolved runoff✓
B)Plant competition from nitrogen-fixing bacteria
C)Reduced sunlight exposure from cloud cover
D)Increased vulnerability to nocturnal frost
💡 Explanation
After sustained heavy rainfall, the increased runoff dissolves crucial soil nutrients due to the heightened saturation, resulting in significant nutrient depletion in the terraced soil. Therefore, nutrient depletion causes a limitation, rather than bacterial action, reduced light, or frost vulnerability which require different environmental conditions.
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