Question

which mechanism requires energy?
o osmosis
o diffusion of oxygen into a red blood cell
o exocytosis
o diffusion of ions through a potassium channel

Explanation:

Osmosis is passive transport of water. Diffusion of oxygen into a red - blood cell and diffusion of ions through a potassium channel are also passive transport processes that do not require energy as they move substances along the concentration gradient. Exocytosis is an active process where cells release substances out of the cell and it requires energy (ATP).

Answer:

C. exocytosis