The Progressive movement (1900-1920) was primarily a response to problems created by (1) abolitionists
(2) nativists
(3) industrialization
(4) segregation

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