Which length of time is accurately represented? A)The years 1920 to 1929 are an era. B)The years 3001 to 4000 are a decade. C)The years 1300 to 1399 are a century. D)The years 2000 to 2010 are a millennium.

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