Why was it important to establish the clean air act? check all that apply?

emphasize cost-effective methods to protect the air

encourage people to study the effects of dirty air on human health

determine ways to reduce the number of premature deaths per year

create a regulation that makes any activities that pollute the air illegal

make sure that no government activities polluted the local atmosphere

The correct statements are emphasize cost-effective methods to protect the air  and encourage people to study the effects of dirty air on human health.

Explanation:

The Clean Air Act offered funds for federal research in air pollution. The Act was established in 1963 and was the first federal legislation considering monitoring of air pollution. It created a federal program within the United States Public Health Service and permitted research into methods for controlling and monitoring air pollution.

(A), (B)

Explanation:

answer; /// i believe that the correct answer is ( monophasic ); ethinyl estradiol- ethynodiol diacetate is a monophasic oral contraceptive agent; ///

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.