Which constraint limited pre-Columbian maize yields in Andean terrace farming, inducing genetic adaptation?

💡 Explanation

Limited nitrogen availability imposed selection pressure; thus, improved nitrogen fixation via genetic adaptation resulted, mediated by microbial symbioses. Therefore the yield increased to overcome the limitation, rather than slope, irrigation, or wall strength affecting crop yields.

• Which consequence arises when the Byzantine silk monopoly faced foreign competition?
• Which outcome results when inadequately fired ceramic bricks experience prolonged exposure to groundwater?
• Which effect accelerated Roman siege tower collapse under artillery fire?
• Which consequence results when Byzantine silk production’s raw input quality declines?
• Which risk increases when Inca terracing loses structural integrity?
• Which outcome occurs when a major aqueduct loses water pressure?