A number of environmental contaminants have been associated with emotional and behavioral disorders. Which of the following has been linked to aggressive behaviors on both a macro/national level and on a micro/individual level?

Lead.

Explanation:

The most dangerous contamination in the environment that is associated with the emotional and behavioral disorders is the presence of the lead in the environment and has been linked to the studied of the aggression in the behaviors of the macro and the micronational levels. Lead can be found in the waters and soil and air mostly due to man-made causes. Being a heavy element its harmful to the body.