Catherine is at a crowded baseball game when she loses track of her son, Nick. Despite the loud cheering and noise of the crowd, she can pinpoint his location when he calls for her because she can distinguish the sound of his voice from the all the other voices. This illustrates theory. a. absolute threshold b. just noticeable difference c. sensory adaptation d. signal detection

d. signal detection

Explanation: Signal detection theory, suggests that we are able to detect a stimulus based on how intense it is and based on physical and psychological state of a person.

This means we are able to notice things based on how strong they are and how much attention we pay to those things.

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.