How does macroevolution happen slowly, if the "stems" of those mutations are useless? Does it actually happen faster than I've thought, like in a couple grandchildren later. That would make more sense to me for now. Is it so?
Elaboration: How can macroevolution happen slowly, if for example, only 0,2% of a wing has to evolve first? That would be useless, so why does the mutation last until it becomes an enough of a wing to actually make any difference?
Or have I just misunderstood how "divides on the species level" happen, and it never does actually happen like that?
