Facilitated diffusion of magnesium ions (Mg ) would occur OUT of a cell if the Mg concentration was outside the cell than inside, and . a. higher, Mg could move through a transport protein across the membrane b. higher, Mg could move directly through the phospholipid bilayer of the membrane c. lower, Mg could move through a transport protein across the membrane d. the same, Mg could move directly through the phospholipid bilayer of the membrane e. lower, Mg could move directly through the phospholipid bilayer of the membrane