Why was it important to establish the clean air act? check all that apply. a)emphasize cost-effective methods to protect the air b)encourage people to study the effects of dirty air on human health c)determine ways to reduce the number of premature deaths per year d)create a regulation that makes any activities that pollute the air illegal e)make sure that no government activities polluted the local atmosphere

The correct options are A and B.

A.Emphasize cost-effective methods to protect the air.

B. Encourage people to study the effects of dirty air on human health.

Explanation:

The Clean Air Act was brought forward to protect the Ozone layer of the Earth from possible pollutions which occur due to human activities. The Clean Air Act was also developed to provide humans with a pollution-free environment to live. The Clean Air Act provides cost-effective methods and finances to remove any kind of waste or pollutant which has consumed an area.

It encourages people to gain knowledge about the harmful effects of pollution that their activities are causing. So that they realize how important it is to stop such activities.

A,B,D, and E are the correct answers

Explanation:

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.