Diffusion is most effective in living organisms, when the surface area is
Answer Details
Diffusion is the process by which substances move from an area of high concentration to an area of low concentration. In living organisms, diffusion occurs through the exchange of gases and nutrients between cells and their environment. The efficiency of diffusion is directly related to the surface area available for exchange and the thickness of the exchange surface.
Therefore, diffusion is most effective in living organisms when the surface area available for exchange is large and the thickness of the exchange surface is small. A larger surface area allows for more exchange to occur, while a smaller thickness of the exchange surface reduces the distance that substances must travel. Conversely, if the surface area is small and the thickness is large, diffusion will be less effective, as there is less area available for exchange and the distance that substances must travel is greater.