Used to elect the president, vice-president, and members of congress

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?

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

Which of the following is a constitutional power that the president shares with the senate?