Forgive me if this is a stupid question but I only have a high school education. Assuming we could even correctly calibrate this molecular clock all we can determine from it is rate of divergence of the non nuetral genes, correct? Then what does this really tell us? Does it only tell us how long there has been no gene flow? What good does that do? Isn't it the nonneutral genes that will ultimately allow the animal to adapt, change and become something else? Couldn't these changes occur anywhere along that timeline on the molecular clock?