During the progressive era nongovernmental organizations such as the NAACP and the ADL worked to gain rights and end discrimination for minority groups. explain what steps these groups took to correct injustices in american life

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