What was one reason why groups of early humans rarely stayed in one place for very long

In italy, the distance between milan in the north and palermo,sicily, in the south is about 550 miles. in the united states, the distance betweenboston, massachusetts, and savannah, georgia, is about 900 miles. do you think the american revolutionaries of 1776 in the 13 colonies faced some of the same challenges as the patriots who struggled for italian unity in the 1860s?  

What notable contributions to science has sandia national labs (snl) produced over the years?

Which terms describe the countries with which the united states and soviet union attempted to ally during the proxy wars? check all that apply. unstable newly industrialized colonial newly independent developing militaristic resource rich