Which primary benefit did the 'waru waru' raised field system provide for agriculture near Lake Titicaca?

💡 Explanation

During nightly freezes near Lake Titicaca, the waru waru system allowed heat absorption into the water-filled canals during the day, creating a microclimate and releasing the heat at night, thus reducing frost damage. Therefore frost resistance was the benefit, opposed to drainage, reduced erosion, or increased nitrogen fixation, which were less direct drivers.

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