as opposed to new organs or such (first create a cell that just so happens to work for the intended purpose, make sure the cell is able to reporduce without using too much energy, which just so happens to grow and produce more of itself every generation, making sure the trait doesn't get wiped out when mating, hope the cell doesn't get damaged, or mutate in a way that would stop its function or reproduction, have it break off and specialize, make it so the cell just happens to have the right proportion of specialized cells, all of which must be able to reproduce and survive, make sure the path to the other organs it needs to connect to just so happens to end up in the right place, along with the connecting organs just so happening to all undergo the same gentic mutation and the same time that would allow proper flow between the organs, make sure the change is not harmful in each and every step, make sure the organism's defenses don't think it is harmful, make sure it doesn't consume to many reources, make sure the organism's transportation system just so happens to be able to connect with the new organ at the same time it's bieng devolped (making sure this part of the DNA also makes it through every generation of reproduction) and most important, make sure every link along the way survies to reporoduction, otherwise the whole process starts over, and that's just for a single organ let alone a whole organ system or a whole orgaism, let alone a community if organisms, and of course every single one of these steps must happen in order at the right time and with evry DNA change being either dominant or having the other mating organism be at the same stage in the mutation process, making sure the organisms the new organism mates with doesn't have a stronger dominant), yeah i guess i can understand how the latter can happen and not the former.