According to Samuel Huntington, how many waves of democratization have there been among modern states?

Eception in psychology is

A) standard in some areas of study. B) unnecessary and should be eliminated. C) ethical under all circumstances. D) a threat to validity.

Abandoned, idle, or underused industrial or commercial properties that may be environmentally contaminated are called ________

A. no-enterprise zones B. blackfields C. dead zones D. brownfields