Which long-term consequence resulted from selective breeding on highland maize in pre-Columbian Mesoamerica terraces?

💡 Explanation

When maize migrated geographically to higher, colder regions, artificial selection enhanced cold tolerance by favouring genotypes better adapted to low temperatures. Therefore increased cold tolerance resulted, rather than yield decrease, soil salinization or blight-susceptibility which lack that geographically directed selection pressure.

• Which structural inefficiency arises when ashlar masonry fortification walls exceed practical heights?
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• Which challenge in ancient Mesopotamian irrigation systems increased risk of farmland salinization over seasons?
• Which navigational risk increased when 18th-century wooden ships exceeded previous length limits?
• Which mechanical process critically limited Inca terrace construction stability on steep Andean slopes?
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