There is less biomass per unit volume available for harvesting in the open ocean, as compared to upwelling and coastal zones, because

Question

Quizplus · Accepted Answer

Open ocean zones have lower nutrient concentrations compared to upwelling and coastal zones due to limited mixing events and lower input of nutrients from land. This limits primary productivity and thus reduces the biomass available for harvesting. Oxygen levels, salinity, and temperature may differ between these zones, but they do not directly affect the amount of biomass available for harvesting. Therefore, options B, C, D, and E are incorrect.

There Is Less Biomass Per Unit Volume Available for Harvesting