A concentration gradient must exist. hope this helps
Midbrain is the uppermost part of your brain it controls some reflex actions which is part of eye movements
Answer: I think it would be A. Facilitated diffusion
Explanation: I think it would be a cause some molecules can move down their concentration gradients by crossing the lipid portion of the membrane directly while others have to pass through membrane proteins in a process called facilitated diffusion
If im wrong srry!
Hope This helped!
