Most of the public health impacts from air pollution are the result of
A) acute exposure to a single pollutant.
B) acute exposure to many pollutants.
C) chronic exposure to a single pollutant.
D) chronic exposure to many pollutants.
D
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Which landform can develop where groundwater dissolves rock?
A. beach B. sand dune C. sea stack D. cave
The __________ represents an ocean that is forming.
A. Red Sea B. Persian Gulf C. Mediterranean Sea D. Tigris-Euphrates valley
During clear sky conditions, the sky is normally blue in the middle of the day, and some combination of red, yellow and orange at sunrise and sunset. This suggests that
A) the sun is close to perihelion. B) atmospheric path length is related to sky color. C) the date is close to one of the solstices. D) the date is close to one of the equinoxes.
A coyote can alter its diet to match seasonal abundance of plants, fruits, or small animals, and would therefore be considered ________
A) a specialist, able to specialize on whatever is available at the time B) a generalist C) an organism with a type II survivorship curve D) density independent and resource-neutral E) an endemic