Out of Darwin's theories on Origin of the Species, his theories on use and disuse have always been the most interesting to me. I am not certain that I have any specific questions, but just that I find it to be the most amazing of all the components he addresses with respect to natural selection. I think that what I would like to hear more about, is how Darwin only attempted to lightly explain the appearance of features from a progenitor later in a species. Though one would assume the trait or structure to have disappeared, it manifests itself later in the line of a species, which goes against this idea of atrophy, but is followed nicely by correlation of growth which minimizes an unused feature, but not getting rid of it entirely.
Is this to say that there is a fluke in natural selection, or is it so perfect of a process that it accounts for error in itself, by not completely ridding a particular organism of unnecessary organs?
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