Wai does mankind alwais hav 2 seperate into classes?

Question

like social classes and stoof

Answer 1

1. " Human imaging studies have for the first time identified brain circuitry associated with social status"

http://www.sciencedaily.com/releases/200...

2. "Researchers have identified brain structures that process the threat of punishment for violating social norms"

http://www.sciencedaily.com/releases/200...

3. "Psychological findings imply that a person's level of dominance could be measured based on their biases favoring vertical representations of power, as is the case in a hierarchy. In an attempt to grasp complex concepts, humans have tried to represent abstractions like power and dominance through visually-stimulated metaphors such as pyramids and steeples. And dominance especially has been measured socially, linguistically and artistically on a vertical dimension, as with upper and lower class divisions in hierarchical structures."

http://www.sciencedaily.com/releases/200...