Answer:
Upwelling movement.
Step-by-step explanation:
Upwelling movement occurs when winds push surface water away from the ocean's shore and deeper water rises to fill the gap created.
During upwelling, wind-displaced surface waters are replaced by cold, nutrient-rich water that wells up from below the ocean's surface.
The upward movement of this deep, colder water is what is called upwelling which has the greatest direct effect on producers' growth.