Why would someone need to know background of United States history to become a citizen?

What was the importance of the open door policy?

Which agency is likely to solve the dispute between susan’s company and the competitor?

Ascientist performs an experiment where she measures the mass of a piece of metal, pours acid onto the metal, washes the metal, and then re-measures the mass of the metal. the scientist repeats the experiment several times, each time increasing the amount of acid used. the dependent variable in the experiment is the: initial mass of the metal final mass of the metal amount of acid used washing the metal