Which process requires the use of membrane proteins?

a) pinocytosis

b) diffusion

c) osmosis

d) facilitated diffusion

In cells, some molecules can move down their concentration gradients by crossing the lipid portion of the membrane directly, while others must pass through membrane proteins in a process called facilitated diffusion.

Explanation: so it is

D :)

yeah I think it is D too to that's what I think it is

thinking it would be physical characteristics

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.