Question

Question 15 A substance moves across a cell membrane from a higher concentration to a lower concentration, without using the cell's energy or the use of membrane proteins, this is due to Time a endocytosis sodium potassium pumps diffusion facilitated diffusion

Answer 1

The process you are describing is **diffusion**. Diffusion is the movement of substances from an area of higher concentration to an area of lower concentration, and it occurs without the use of cellular energy (ATP) or membrane proteins.