According to a recent study, species are going extinct at a rate ________ times faster than natural pre-human extinction rates.
A. 100
B. 1000
C. 10000
D. 100000
Answer: B. 1000
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Countries that have completed or nearly completed the demographic transition experienced
A) the epidemiological transition and industrialization over 100 years ago. B) the epidemiological transition and industrialization within the last decade. C) a resource and technology transition that gave rise to the green revolution. D) a political and sociological transition that gave rise to increased rural lifestyles.
Rainwater is naturally slightly acidic. Which gas causes this?
A) N2 B) O2 C) CO2 D) SO2
Downdrafts tend to dominate during the ____ stage
a. cumulus b. dissipating c. precipitating d. developing e. growth
Among the most important characteristics of chemicals in determining their environmental risks is/are
A. Solubility B. Reactivity C. Toxicity D. Persistence E. All of these