Which outcome increases when ancient chinampa agriculture lacked weeding?

💡 Explanation

Increased weeds promote algal blooms on chinampas, because they release nutrients; eutrophication is the mechanism. Algal blooms produce toxins, raising water toxicity; therefore toxicity is correlated to weeding efficacy rather than berm erosion, oxygen levels or changing temperatures.

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• Which outcome commonly resulted when pre-Columbian chinampa farmers unknowingly introduced excessive nutrients?
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