What was the last period that had dinosaurs

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?

What is “the compromise of 1850? ” *

Acurb of this color means you may not stop a) yellow b)green c) red d) blue