How did monasteries preserve european learning

What best describes the transportation within cities in the early 1800s

Which statement from the declaration of independece best reflects the enlightment ideas of popular sovereignty

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