What limits do anthropological studies of modern societies have

With an american government question

What do these fatwas indicate with regard to the balance between practical legal reasoning and religious dictates answers?

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?