When people use plastic combs on their hair, the combs become negatively charged. which statements about this situation are true

The combs get electrons from the hair hence acquiring static energy. Only electrons move from one material to another; protons do not move.

dopamine..

"it was found that some people who were taking the drug l-dopa to raise their levels of dopamine were developing schizophrenic-like symptoms supporting research a strength of the dopamine hypothesis is that there are many studies which have shown support for the neurochemical explanation."