Final answer:
Camels were the key animals used for transportation across the Sahara Desert, revolutionizing trade and interactions between regions.
Explanation:
In the context of transporting goods across the Sahara Desert, the animal primarily used was the camel. These animals revolutionized trans-Saharan trade due to their unique abilities to endure long distances without needing frequent water replenishment and navigate through sandy terrains with ease. The introduction of camels boosted trade in West African gold, ivory, and ostrich feathers, facilitating interactions between nomads and settled societies.
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