The EPA sets national air-quality standards for common air pollutants. The graph shows the change in the concentrations of these pollutants over time.

Which conclusion do the data in the graph support?

A. Concentrations of all pollutants have increased.

B. Monitoring concentrations of pollutants is too expensive.

C. Monitoring concentrations of pollutants has been ineffective.

D. Concentrations of all pollutants have decreased.

did u get the answer? /? ? / me

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.

b. climate change will cause an increase in biodiversity of all ecosystems.

hope this