Why do areas of upwelling tend to have large and diverse populations of organisms?
A) Upwelling lowers the level of oxygen in the water.
B) Upwelling mixes deep-ocean fresh water with salt water from rivers.
C) Upwelling brings nutrient-rich water up from the ocean depths.
D) Upwelling moves dinoflagellates to the aphotic zone.
E) Upwelling brings aphotic organisms to the ocean surface.
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