Final answer:
The surface area to volume ratio is an important concept in understanding the efficiency of diffusion. As a cell increases in size, this ratio decreases, making diffusion less efficient.
Step-by-step explanation:
An important concept in understanding how efficient diffusion is as a means of transport is the surface area to volume ratio. This ratio represents the amount of surface area compared to the volume of a cell or object.
As a cell increases in size, its surface area to volume ratio decreases, making diffusion less efficient. This is because the larger the cell, the less surface area it has for gases and nutrients to diffuse into and out of the cell.