[Tom]

About the world being complex, maybe its all just chance. There are planets out there with noone living on them because they physically can't, but because of our environment we can adapt to the environment (the environment does not adapt to us) and over years we can change ever so slightly so within a few million years we have changed again to fit out surroundings.

If we were a cm closer or further away from the sun then the world wouldn't be how it is as animals wouldn't be able to cope. Maybe that is just down to chance, it doesn't mean that there would be no life, there could be another form of life that can adapt to the new surroundings.

Also scientists only theorise the big bang and (Darwin's) evolution anyway, it doesn't mean it actually happened. Although the human mind can't process the thought there is nothing to suggest the world hasn't just always been here.