Which animal did the native americans of the great plains rely on for food and a variety of other uses?

Need it now explain gorbachev’s policy of glasnost. how did this policy change the soviet union?

Brainliesttt !me : ) why were the eastern european countries attempting to break free of the soviet union?

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