D alv that is the right answer
Answer:
i think it might be the system of public works
Explanation:
bridges and highways are public transportation I don't think they would work on military bases. railroads and air travel would make sense but public works covers everything. let me know if you got it right.
Answer:
Earth day is an even that increases the awareness of the world's environmental issues.
Explanation: Earth day is celebrated in the United States for the first time on April 22, 1970. Millions of American people participated in this celebration. This includes, thousands of students from many different colleges and universities. They all participated in rallies, marches and my different educational programs across the country.