Which principle of american government is reflected in this quote?

Which groups of people most directly benefited from song innovations in the song dynasty‘s open border policy?

Sarah has been collecting intensive interviews with women who organize in grassroots movements for wages for housework. now she is looking over the interviews and trying to find common themes within them. what part of the research process is she in?

It has been reported that the dna of the elephant shark has barely changed over the last 420 million years. which statement explains why the elephant shark has not changed over time?