How has the EPA improved air quality over the last 30 years?

by monitoring pollutants and passing regulations to reduce air pollution
by decreasing soil erosion and dust storms
by building marine refuges to help protect marine life and reduce air pollution
by decreasing of fossil fuel use in motor vehicles and industry

a

Explanation:

all of the other options make no sence at all

were talking about air not water

also dust storms really!?

and the last one is kind of true but the first one has more detail

what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.