Natural pollutants can play an important role in controlling air pollution for which of the following reasons?
A.They function as part of a purification process.
B.They occur in greater quantities than other pollutants.
C.They are less harmful to living beings than are other pollutants.
D.They have existed since the Earth developed.
A.They function as part of a purification process.
B.They occur in greater quantities than other pollutants.
C.They are less harmful to living beings than are other pollutants.
D.They have existed since the Earth developed.
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