After a bill is made who approves and signs the bill into a law

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?

Music the height of a wave or the amount of the wave carries is the amplitude. a.air b.nodes c.speed d.energy

Spanish for "estate," this was a type of plantation or other economic activity in spain's "new world" colonies.