In a market economy, what is true of all trade? it is expensive. it is voluntary. it is ordered by the government. it is forced by the seller.

According to experts for every person killed outright by a nuclear blast four more would die later from the

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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