What is the difference between Serial Killer and Mass Murderer -Serial killers have a psychological problem
-Serial Killer have a cool off period
-Serial Killers do not use guns
-Serial Killers kill more than 3 people

they have a cool off period.

serial killers kill more than 3 victims over a span of month maybe even years. however a mass murderer will kill over 3 victims in a short span of time.

answer: the answer is d

explanation: the answer is d because if motorcycles are always in your blind spot and you don't see them this can result into an unwanted collision and result in serious injury or death. therefore this is not a safe skill you can use regarding motorcycles.

their just depressed and think that if they give pain to some one else the pain goes away from them. which it doesn't.