The armies of ancient Rome often had to cross rivers to reach distant parts of the empire. This posed a problem because bridges built by earlier civilizations could not bear the weight of many troops. The Romans overcame this obstacle by building

This would be a true statement

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.

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