Is there a single universal moral code that is binding on all people at all times and in all places? If so, how are the differences in moral perspective to be accounted for? If not, how can people with different moral perspectives be expected to live in harmony, and how is the notion of progress in ethics to be understood?    ***Do human beings have a natural tendency to good, a natural tendency to evil, or some combination of tendencies? What are the implications of the answer for ethics?