Which environmental change results when pre-Columbian chinampa agriculture expands in Mesoamerica's wetlands?

💡 Explanation

When expanding chinampa agriculture, decomposition of introduced organic matter from lake sediments and decayed plants occurs because of microbial action in the constructed wetlands, accumulating organic matter in the soil. Therefore, soil organic matter increases, rather than increasing oxygen, reducing runoff, or decreasing sequestration, which involve different biochemical processes.

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