Cultural effects of networks of exchange c. 1200 - 1450. Anyone?

Where did zebulon pike spend most of his time exploring?

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

Which quotation from the declare ration of independence shows the idea of the social contract