What allows Nancy to run without watching her feet and jump out of her truck without thinking about it?

proprioception

Explanation:

Proprioception also known as kinesthesia or described as the "sixth sense" explains one's natural ability to perceive his body's position and movement such as kicking a ball without looking at it. In the example Nancy is able to run without watching her feet because of this instinctive ability. Proprioceptors and mechanosensory neurons are located in muscles, joints and tendons and mediate this process

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place