"Vote Yourself a Farm and Horses" - Abraham Lincoln, 1860
A disadvantage of a case study is that the subjects often report what the researcher is looking for.
There can be certain other disadvantages of case study as well. The uniqueness of a data in a case study means that the data cannot be replicated for other instances. These case studies have a certain level of subjectivity and the researcher bias can be a problem in such a case.
Researcher's bias can be an issue because his or her own opinions might interfere with the collection as well as analysis of the data. Because of the in-depth nature that the data holds, the research cannot be conducted on a large scale.
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Answer:
The respiratory system transports oxygen to cells, while the circulatory system provides oxygen for cells.
The speaker describes frustration with racial inequality