Main Research Question for Tang Dynasty.

What would you call a political system that is only meant to last for a short time

Brainliest to who answers! what will always cause a supply curve to shift to the left?

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?