In 2013, most species in the world go extinct because
A) of new diseases spread by human contact.
B) humans harvest them or kill them as pests.
C) of loss of habitat.
D) global climate change is causing their environments to rapidly change.
C
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Is the rate of Earth's rotation increasing or decreasing?
A. It is increasing. B. It is remaining relatively steady. C. It is decreasing. D. It is increasing and decreasing in cyclic fashion.
Snow measurement:
A) is best done with a rain gauge. B) usually involves estimating the water content of snow. C) can only be measured by human beings. D) uses the same instruments as does rain measurement.
On March 21 the sun will be directly overhead at
A. A. B. B. C. C. D. D.
What is conditionally unstable air?
A. air that resists uplift B. stable air that lifts and then becomes unstable C. air that does not resist uplift D. unstable air that lifts and then becomes stable E. air following the environmental lapse rate