​Which of the following best describes the concept of cultural evolution?

A) ​Cultures may change over the course of time.
B) ​Cultures advance over the course of time.
C) ​Cultures break into new cultures over the course of time.
D) ​All cultures emerge from a primitive nonanimated state.

Which of the following is not a common mechanism used in tribal societies as a means of political integration?​

A) ​racial typing
B) ​common-interest groups
C) ​age grades
D) ​age sets