Biology, 20.10.2020 20:01 arielpraczko1

Throughout human history, major migrations have been spurred by sharp decreases in the availability of food caused by hazards or changes in climate. For example, the —————

was the result of a drought and wind-driven erosion. The

—————

on the other hand, was caused by a fungal disease that infected an important crop.

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Throughout human history, major migrations have been spurred by sharp decreases in the availability...