4) Compare how different molecules can diffuse across a purely lipid bilayer membrane with no proteins. begin{tabular}{|l|l|l|l|} hline Substance & HydrophobicorHydrophilic? & LipidBilayer Permeability(highorlow)? & Explain why it crosses the way that it does. hline Nonpolar Molecules & & & hline Polar Molecules & & & hline lons & & & hline Oxygen (O2) & & & hline Glucose & & & hline end{tabular}.