Answer:
I think the guards fought each other
Explanation:
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Research ethics are general rules that are followed when doing experiments to insure that no permanent harm comes to the test subjects or anybody else as a result of the research. This is perhaps even more important in sociology because the test subjects are human.
The answer is the engine. The leaking black fluid indicates that you should check your engine. There are a few factors to to why this happens and these are: worn oil gasket, oil filter not attached correctly, corroded oil coolant line, not secured oil plug, high oil pressure.
