Wait you said, "
Aggression can either be a learned behavoir or a Nurtured behavior meaning that its based on the up brings of animals.
. You just said the same thing twice. Perhaps you meant to say aggression is either a learned behavior or it is a natural behavior meaning it is a natural behavior they were born with.

Either way, I don't think aggression is that black and white. I believe with snakes, they are naturally aggressive, especially babies, but for the most part it isn't true aggression, just a feeding response. In a wild setting, aggression is not learned. They have to be "aggressive" from the start to catch their food and to defend themselves.

Now here is where I think it gets into a gray area. In captivity, snakes have no real need to be defensive. There are no predators and the only "aggression" that is necessary is a feeding response. I feed both live and frozen thawed and I see no difference in aggression in any of my snakes, no matter what they are fed. Though some snakes are aggressive for what seems like no reason. I have one girl who is fed strictly frozen thawed and she is the most aggressive snake I have. She has not bitten but I think given the chance, she would.

Also snakes who are mistreated have more reason to be defensive. A snake that is constantly provoked or teased (poking, teasing through the front of an enclosure, etc) will be more aggressive than a snake who is treated with respect and handled correctly.