Trans-Saharan trade requires travel across the Sahara between sub-Saharan Africa and North Africa. While existing from prehistoric times, the peak of trade extended from the 8th century until the early 17th century. ... Cattle were introduced to the Central Sahara (Ahaggar) from 4000 to 3500 BC.
Answer:
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D. animals and also plants use photosynthesis the store energy and use other energy in food
Answer: making manifest destiny an official federal policy
