Which of the following does not need to be considered when you are determining a source’s credibility? a. the author’s credibility b. the perspective of the topic c. the professional appearance of the source d. the type of information available from the time period select the best answer from the choices provided

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