raekwonpowell10
22.03.2020 •
Biology
Need help quizz
Why was 1990 an important year regarding air quality? Select two options.
1.The United States took first steps to keep the air clean.
2. Cost-effective ways to reduce pollution were emphasized.
3.The United States created the environmental protection agency.
4.Modifications and improvements were made to the Clean Air Act.
5.Funding was established under the Clean Air Act to study air pollution.
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Ответ:
D. nitrogen
Explanation: