Which word best describes Roman mythology

Which type of evidence would support the author's claim?

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

Chen's research team randomly assigned some newborns and their mothers either to a breastfeeding promotion group (where breastfeeding was encouraged, but not required) or to a normal pediatric care group (where breastfeeding was neither encouraged nor discouraged). which research method did they use?