Which number represents the city of rio de Janerio

Which political reform gave people the power to put a proposed law on the ballot? referendum initiative direct primary recall

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?

Where do buyers and sellers go to exchange a specific product