Final answer:
The starting point for the gradient of transfer in diffusion is determined by the extent of the concentration gradient, where a greater concentration difference results in a faster rate of diffusion, slowing as equilibrium nears.
Step-by-step explanation:
The starting point for the gradient of transfer depends on the extent of the concentration gradient. In the context of diffusion, the gradient refers to the difference in the concentration of a substance across a space. The greater the difference in concentration between two areas, the steeper the gradient and the more rapid the rate of diffusion. As the substance moves from an area of higher concentration to one of lower concentration, the gradient decreases, which in turn slows down the rate of diffusion. This will continue until equilibrium is reached, at which point there is no net movement of particles due to an even concentration distribution.