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Which of the following is true regarding research on depression?
Depression is linked with abnormally high levels of the neurotransmitter serotonin.
Depression is typically unrelated to stressful life events.
There seems to be no association between depression and genetic predispositions.
With each new generation, depression is increasing in its prevalence.
There is an excessive amount of brain activity in the frontal lobes of people who suffer from depression.