Which of the following would best represent balanced forces? A. A dog pulling a sled speeds up as he goes down the hill. B. An object traveling at a constant speed of 70 mph. C. A ball rolling across the floor slows down due to friction. D. A man begins pulling a wagon.

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."

where are the vectors ?