Earlier quoted context omitted.
How can evolution not happen in a system where you have random mutation and some selection pressure?
Oh, well the 'current' argument is that it's unlikely for a bunch of reasons. - cambrian explosion of life is seen as unlikely given that changing random genes or dna mutations has such a low success rate in generating new life, that an explosion of life happening all at once seems out of step with the math. - we don't know how to create life at all. adding up bits and pieces of molecules into cells and onwards can b…
I'm not very well versed on that topic, but as for speciation, that happens very easily. For example even relatively short term separation of populations can stop interbreedability, e.g. by changing mating behavior. Once that happens it's just a matter of a few million years of random walks to grow feathers where there has once been fur.