Which constraint limited maize agriculture across pre-Columbian North America prior to development of specific varieties?

💡 Explanation

Prior to variety development, northern latitudes limited maize cultivation because the mechanism of temperature-sensitive enzymes controlling growth restricted grain maturation to longer, warmer seasons. Therefore a short growing season restricted its spread, rather than simple nutrient deficits, pests, or rainfall, all of which could be partially addressed through other means.

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