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Plz 50 points answer only if you know and dont copy from others draw conclusion explain how trade in the east african city-states resulted in a blending of cultures. provide examples

Was the first african american to be appointed to the u.s. supreme court.

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