What did hippies do to show their disapproval of the vietnam war

In one to two paragraphs, compare and contrast the american, french, and mexican revolution.

Which of the following factors would be a likely reason for low population density

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