The fact that the distribution of colors becomes unequal or different in 2 3 generations
Explanation:
Edwin is arguing that natural selection will take its course among the population of the rabbits because they all contain different features and the done that gets to be the strongest among them will be the one that reproduces the most.
Thus, this can be proven the best if there is a considerable change in the mark up of the population in a few generations.
If there is a change in the average skin color of the animals then we can say that the natural selection is working.