The movement of molecules from an area of higher concentration to an area of lower concentration without energy or carrier proteins is called simple

The movement of molecules from an area of higher concentration to an area of lower concentration without the use of energy or carrier proteins is called simple diffusion. This is a fundamental concept in biology and chemistry, describing how substances such as gases and small molecules move across membranes or within fluids. Simple diffusion occurs spontaneously as molecules naturally seek to reach an equilibrium state, balancing their concentrations on both sides of a barrier.

Examples of simple diffusion include the movement of oxygen into cells and carbon dioxide out of cells across the cell membrane. This process is essential for various biological functions, including respiration and the transport of nutrients. Climate factors such as temperature can also influence the rate of diffusion, with higher temperatures generally increasing the speed at which molecules move.