What is the difference between diffusion and facilitated diffusion?
A. Facilitated diffusion requires energy
B. Diffusion moves substances from
low to high concentration
C. Facilitated diffusion uses carrier proteins
to move substances in or out of the cell
D. All of the above

option A and C

Explanation:

option a is correct i.e.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.

he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.