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.
Answers: 3
Biology, 22.06.2019 03:30, masonorourke
Which group of algae is characterized by unicellular organisms and includes some members that would be better classified as zooflagellates? euglenophytes red algae sporozoans green algae
Answers: 2
Biology, 22.06.2019 05:00, mydoggy152
Penelope studies how the structure and function of the nervous system is related to behavior. she is a psychologist
Answers: 1
Biology, 22.06.2019 05:30, ddavid9361
Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above
Answers: 1
Biology, 22.06.2019 06:30, gordonandrea313
What molecules does hemoglobin decay into over time
Answers: 1
The EPA sets national air-quality standards for common air pollutants. The graph shows the change in...
English, 03.01.2020 23:31
History, 03.01.2020 23:31
Social Studies, 03.01.2020 23:31