The answer to this question is Voluntary.
One negative aspect about the voluntary aspects of research is that it may damage the validity of the research.
For example, if research is being done through questions about certain topics. People who know the purpose of the research could fake the data to obtain positive results.
Answer:
c is the answer for the question
During the 13th century, the Mongols launched a series of devastating military raids on eastern Europe, especially in what is present-day Russia. This shaped the self-defense mentality of the region for centuries to come.
Meditation. people who work to spread their religious beliefs are called blank. missionaries.
Answer:
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