What is the meaning of this line of the declaration of independence

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

4. what were some of the losses suffered by germany as a result of the treat of versailles?