Attitudinal data show that Americans' belief that it is possible for a person to start at the bottom of the economic ladder and work their way to the top has in the last 20 years.

Geography affect the locations of economic activities by the following factors -transport government policies labour market

The correct answer is a. when they started making tools that will them in cultivating lands, they could raise crops and that made them attached to one place for a longer period of time. after that, they started domesticating animals and building their own permanent settlements that resemble the ones we have today.