Answer:Because plasma membrane structure contain Llipids and protein.
Explanation:
Lipid make it differential permiable while protein make it selectively permiable , Protein act as carrier (permiase) Also Act as receptor and provide receptor site , control the concentration of substance and many other function.
No because there are different types of cells and they have different processes.
<span>D. the crust
Thats the surface of the earth.</span>