Which is TRUE of Southern industry in the antebellum era of the U. S.? 1.) It produced goods that were rarely exported.
2.)It focused on banking and finance.
3.)It didn't really exist.
4.) It provided about 60% of U. S. exports.
5.) It accounted for about 1/3 of America's manufacturing.

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?