9. for which of the following were "four-minute men" responsible? (5 points
ensuring factory production lines were as fast as possible
encouraging citizens to plant victory gardens and conserve food
giving short speeches in public places to urge americans to support the war

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