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Biology, 11.10.2020 01:01 qvezne7683

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 β€”β€”β€”β€”β€”
was the result of a drought and wind-driven erosion. The
β€”β€”β€”β€”β€”
on the other hand, was caused by a fungal disease that infected an important crop.

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