Which mechanism requires energy?

a) diffusion of oxygen into red blood cell

b) diffusion of ions through a potassium channel

c) osmosis

d) exocytosis

d is the correct answer because Exocytosis is a type of vesicle transport which cells use to move substances out of their interior. It is an active process because it requires the energy of ATP to occur. ATP occurs when the last phosphate breaks tahts how energy flows through

The answer would be D. Exocytosis