Evolution of the Eye
One of the arguments used by suppoprters of creationism is that there are some structures--such as an eye that are so complex that it is impossible for them to have evolved. The difficulty with this argument is that each example cited in the past--such as the evolution of the eye--is ultiately pretty well explained by evolution. Nonetheless, I thought that this explanation from Scientific American was an especially good one. It also does a good job explaining the randomness of mutations. The question being answered is "If mutations occur at random over the entire sequence of a species' genome, how can a complex organ such as an eye evolve? How can all the mutations that direct the development of that organ be concentrated in the right places?" Here is the answer (in full) by University of Utah biologist Jon Seger : Looking back through the history of a species' genome, mutations do indeed appear to be attracted to certain genomic locations (and likewise repelled by o...