Answer:
Explanation:
Between about 800 and 1200 AD, partly in response to the new currents of trade, Africans in the southern sahel developed a set of trading states with an elaborate organization.Well before 1500 AD, a number of states had come into existence, that had no connection at all with the trade across the Sahara.
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Allergies. Allergies can trigger inflammations and dry skin.
Economics depends the most on statistical techniques.
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Perennial plants are plants that have a live cycle of more than two years or can live for more than two years while annual crops are crop that only last for one years and are replanted every year. Perennial plants are mostly trees while annual plants are mostly crops.
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