Examlex
Which of the following mass spectra shows the presence of bromine in a compound?
I II
III IV Four spectra above: courtesy of SDBS: National Institute of Advanced Industrial Science and Technology
Unemployment Rate
The statistic representing the percentage of the labor force that is out of work but seeking employment.
World War II
A global conflict lasting from 1939 to 1945, involving most of the world's nations including all of the great powers, eventually forming two opposing military alliances: the Allies and the Axis.
Social System
A complex set of human relationships interacting in many ways within a community or society.
Scarcity
The fundamental economic problem of having seemingly unlimited human wants in a world of limited resources.
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