What would happen to the membrane potential if sodium ions were allowed to flow down their concentration gradient?
(a) the interior of the cell will become less negative
(b) the interior of the cell becomes less positive
(c) the exterior of the cell becomes less negative
(d) the exterior of the cell becomes more positive

a) The interior of the cell will become less negative.

Explanation:

The Sodium-Potassium pump pumps 3 sodium ions to the extracellular up their concentration gradient resulting in a more negative interior. When the sodium is allowed to move down their concentration gradient the interior would be less negative.

the oceanic zone is typically defined as the area of the ocean lying beyond the continental shelf, but operationally is often referred to as beginning where the water depths drop to below 100 meters (328 feet), seaward from the coast to the open ocean.

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.