In history, religion has played a very large role in cultures and many civilizations were based upon a certain religion. In Christianity, for example, the entire world was created, went corrupt, and then was ruined and restarted basically. But the people that then restarted the earth's population were all God-fearing people who followed the Bible as to the best of their ability. Throughout history, many morals have gone astray and beliefs have changed, but I think that deep down many people still have a belief, or at least respect, for those founding morals found in religion thousands of years ago. Stephanie I am going to have to agree with Stephanie, expect I would generalize it more.
Lets say that morals are derived from culture or ethnicity, instead.
This topic is a great place to apply this question. Since I dont even know what to call Nurture, I will leave this question for now. I think a universal set of morals exists and is extremely powerful in controlling our actions. I think that morals are inherent in each one of us, however it is the level to which we respond and react to these morals that separate and individualize us. In a Yin and Yang sort of dichotomy morals are recognized only in contrast to a lack thereof.