How are roman law, the justinian code, and the napoleonic code related?

According to ohrp, a problem is an “unanticipated problem” when it meets which of the following criteria: unexpected, related or possibly related to the research, suggests that the research does not put the subjects or others at greater riskunexpected, related or possible related to the research, suggests the research puts subjects or others at greater riskunexpected, unrelated to the research but still occurring with a subject, suggests the research puts others at greater riskexpected, related or possible related to the research, suggests the research puts others at greater risk

What are the most populous and least populous areas of russia? and why are some areas more heavily populated than others?

What caused the settlement of more african americans in the mississippi alluvial plain region then in the ozark mountains region?