What structure in the plasma membrane allows large molecules to pass in and out of the cell?

The plasma membrane is selectively permeable; hydrophobic molecules and small polar molecules can diffuse through the lipid layer, but ions and large polar molecules cannot. Integral membrane proteins enable ions and large polar molecules to pass through the membrane by passive or active transport.

Explanation:

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .