It is the media and peer pressure. it is a problem because more media that influences it is being produced and that means more teens are being sucked into it and when more teens do it other teens do because or peer pressure.
True, and the eating disorder are the physical acts from an emotional/psychological disorder
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The answer to the question is punishment. Or more specifically, positive punishment.
Positive punishment occurs when a behavior is given a negative consequence for the individual doing the behavior.
Sara no longer wants to ask questions (the behavior) because she is ridiculed by Mr. Smith (the punishment).
Reinforcement is inaccurate because reinforcement always gives positive consequences for the individual doing the behavior, be it by introducing a pleasant consequence or removing an unpleasant one.