How would the exchange of molecules between an organism and its environment be affected if the membrane were less permeable? (3 points)

a) Fewer membrane proteins would be needed to carry out active transport of nutrients.

b) Molecules needed for growth would have more difficulty diffusing across the membrane.

c)Organisms would be more susceptible to harmful substances crossing the membrane.

d) The membrane would rearrange to form a single phospholipid layer to transport materials.