North Korea is a dictatorship, and the government is not allowing medical aid from abroad because they don't want to loose their control of the territory.
They also don't use the methods of farming found in other places and which proved to be more efficient.
The harmful effects on humans and animals are important for enforcing air pollution.
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Answer:The family history method,
Explanation:The family history method, is the method in which participants are questioned about their history of psychiatric illness relatives which is useful method in psychiatric research or study. This is done in order to evaluate the influence of family history on psychiatric illness
