Which of the following mass spectra shows the presence of chlorine in a compound? 
I II 
III IV Four spectra above: courtesy of SDBS: National Institute of Advanced Industrial Science and Technology
Definitions:
Arthur Jensen
A controversial American psychologist known for his work on intelligence and his argument about racial differences in IQ.
Ethnic Differences
Variations or disparities among ethnic groups in aspects like culture, language, and social structures.
Ethnic Differences
Variations in genetics, culture, tradition, language, and social structure among ethnic groups.
Social Classes
Categories of individuals in a society grouped based on their economic status, occupation, and associated social practices, which can affect their life opportunities and experiences.
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