What was the purpose of the united nations? a) it wanted to stop the spread of democracy b) it was an assembly of nations to work out issues facing the world. c) the initial purpose was to decide consequences for the aggressors in world war 1 d) the united nations was used to enforce communism and socialism

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