A category of objects, action, events, or states of being that share common features is

In class today, Robert turned to Slim and said, "What did you get?" To which of the elements of psychological testing is this question relevant?

a) reliability b) norms c) validity d) divergence

Even if they have the same parents and share a home, each sibling in a family experiences the environment differently, and research has shown that parents do not treat each child the same. What is this phenomenon known as?

a) shared heredity b) shared environment c) nonshared heredity d) nonshared environment