Upwelling zones of high biological productivity, Biology

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Upwelling zones of high biological productivity are found along the western coasts of the major continents. What causes this upwelling? a- cold currents moving from the equator toward the poles. b- warm currents moving from the equator toward the poles. c- cold currents moving from the poles toward the equator. d- warm currents moving from the poles toward the equator.


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