I believe it would be mesentery
Answer:
The simplest mechanism by which molecules can cross the plasma membrane is passive diffusion. Passive diffusion is thus a nonselective process by which any molecule able to dissolve in the phospholipid bilayer is able to cross the plasma membrane and equilibrate between the inside and outside of the cell.
Letter B is the correct option
Answer:
Cell theory
Explanation:
Also known as the cell membrane.