When variables are closely related and difficult to separate they are known as ____

The arousal theory of motivation would be most helpful for explaining why:

a. recreational skydivers jump out of airplanes. b. hungry fishermen venture across dangerous ocean waters. c. starving prisoners are preoccupied with thoughts of food. d. sexually active teens learn to practice effective birth control.

What is the term for a substantial disruption in the rhythm and fluency of speech and is the most common speech impairment?

a) Echolalia b) Auditory language processing delays c) Stuttering d) Dyspraxia