4) A plane flying experiences an air resistance of 20,000 N, how much thrust force is required for the plane to be in equilibrium?

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."

c. magnitude and direction