Biology

The correct answer is: D.It allows only small, nonpolar molecules to pass through easily.

The lipid bilayer of the cell membrane is selectively permeable, meaning it allows some substances to pass through while blocking others. The key reason for this selectivity is the hydrophobic (water-repelling) nature of the interior of the bilayer.

1.Small, nonpolar molecules (such as oxygen, carbon dioxide, and lipids) can easily pass through the lipid bilayer because they are able to dissolve in the hydrophobi...