When did the Dust Bowl occur and why?
A. 1890s; wind
B. 1930s; wind
C. 1930s; water
D. 1890s; water
Answer: B
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Wetlands are valuable components of nature because they
A) provide critical wildlife habitats. B) support bacteria that break down contaminants. C) store excess water and then release it slowly during drier times. D) perform all of these services.
Through its use in many international scientific conferences, air traffic control, and international diplomacy, which language has become the dominant language facilitating increased global interaction?
A) French B) English C) Chinese D) Arabic
A vesicular igneous texture indicates that
A. the ash and pumice were hot and became compacted. B. the rock cooled slowly. C. the rock broke apart as it flowed. D. there was a lot of gas in the magma. E. the rock cooled quickly.
Where in a T-cell receptor does binding to the antigen occur?
A) in the constant region B) in the variable region C) in either the constant or the variable region D) in both the regions simultaneously