Which opinion is one important source of public opinion? a. the bill of rights b. mass media c. pollsters d. public officials

A important source of public opinion is Mass media as it gives a huge platform to express themselves individually.

after the spaniards introduced horses to plains native americans, the lives of the tribes changed. tribes became less settled and sedentary. the horse allowed them to hunt animals such as bison or buffalo, and, instead of staying in one place, tribes began to be nomadic.