What underlying social factor causes a great deal of instability in many of the new African nations

Which did president carter refuse to do in his attempt to free american hostages taken by iran?

What three political groups came out of the french revolution?

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