Which effect commonly restricted the maximum height of Inca terrace farming systems?

💡 Explanation

When altitude increased, reduced oxygen levels limited the yields of staple crops. Because crops need sufficient oxygen for respiration within their cells, at high altitudes this respiration rate decreases impacting plant health. Therefore reduced oxygen is the limiting factor, rather than rainfall, sunlight, or water which terrace construction techniques could partly overcome.

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• Which structural failure mode commonly affected timber sailing ships as they aged, especially in tropical waters?
• Which structural failure increased sharply when cast iron bridges replaced stone arches in the 19th century?
• Which risk increases when substantial moisture permeates a Roman road's layered structure?