The key points are: 1) the process is iterative, not a single "roll" that has to turn out right 2) each generation is a modification of the previous one, not

The key points are: 1) the process is iterative, not a single "roll" that has to turn out right 2) each generation is a modification of the previous one, not a completely new "roll" 3) some states more likely to progress to the next generation than others We occur in an environment where these conditions are satisfied. Why that is the case is a question well beyond the scope of evolutionary theory.