To be a "motorcycle," a vehicle must have two wheels, handlebars, and a motor, which illustrates that this criteria for a motorcycle is a disjunctive concept

Which of the following is true regarding the relationship between obsessive-compulsive disorder (an anxiety disorder) and obsessive-compulsive personality disorder?

A) You cannot suffer from both of them at the same time. B) Some people with obsessive-compulsive personality disorder also experience obsessive- compulsive disorder (an anxiety disorder). C) The most likely disorder comorbid with obsessive-compulsive personality disorder is obsessive-compulsive disorder (an anxiety disorder). D) The two obsessive-compulsive disorders are comorbid over half the time.

Which of the following is an indicator of the Upper Paleolithic period in human evolutionary history?

a. Humans began to bury their dead. b. Humans began to walk. c. Humans began to read. d. Humans began hunting animals.