Some populations are very difficult to study because they engage in clandestine, socially disapproved, or concealed activities like drug sellers and prostitutes.

Name: Some populations are very difficult to study because they engage in clandestine, socially disapproved, or concealed activities like drug sellers and prostitutes.
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Question

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These populations are often referred to as "hidden populations" because of the difficulties in accessing and studying them due to their secretive nature.

Some Populations Are Very Difficult to Study Because They Engage