What is a major source of alienation in industrial societies, according to marxist conflict theorists?

Derek is working on a thesis on the changes in social behavior in the context of finding partners. an important part of his study concerns the various practices followed by males and females over the course of generations and how they have gradually transformed into our current social norms. derek can be called a(n) psychologist. (tb75)\

What does this quotation from the introduction of thedeclaration of independence do?

Personality traits.. .remain stable throughout life ..change at different rates to different degrees ..are more obvious during childhood ..all of the above