Answer :
Final answer:
The Incas had to use terraced farming in the mountains to make efficient use of limited arable land.
Explanation:
The Incas had to use terraced farming because they were located in the mountains. Terraced farming involves cutting steps into the steep slopes of the mountain and building flat platforms for farming. This technique helps prevent erosion and allows the Incas to make efficient use of the limited arable land in the mountainous region.
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