Which factor does NOT directly affect the abundance of marine organisms? Human population Dissolved oxygen Water temperature Availability of light and nutrients

The factor that does NOT directly affect the abundance of marine organisms is human population. While human population can indirectly affect the abundance of marine organisms through factors such as pollution, habitat destruction, and overfishing, it is not a direct factor in the same way as dissolved oxygen, water temperature, and availability of light and nutrients. These factors directly influence the physical and chemical conditions of the marine environment, which in turn affects the abundance of marine organisms.