Which describes the potions on a horizontal number line.

All points to the left of one are positive. All points to the left of zero are negative. All points to the right of zero are negative.

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."