Answer:
Emission Standards is your correct answer.
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The greatest change in the West that was brought about by railroad expansion was a drastically increased population size, since people could now claim land and travel far more easily.
Answer:
The need for public transportation arose in the age of rapid industralization in Europe and the USA. Public transport vehicles and a city system were needed for the masses of workers that had to move and work in shifts in the urban factories .
Explanation:
C is the answer I believe to your question