Q Buscar Cap. 6 Europa en... (Grupo 8-1 ESSO 121-1613 Continuidad y cambio en las sociedade...)
Antes del descubrimiento de América, las dos rutas comerciales que existieron entre Europa y
Las Indias fueron:
(2 puntos)
seda y las especias
las especias y pieles
seda y arroz
5
nercio con China.​

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?