Why did muhammad leave mecca for medina?

Who is the executive branch checking when the president calls a special session 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?

Which of the following is not part of the constitution