What is the meaning of "ambulatory surgical center"?

Toward the end of the roman empire, what caused a decrease in the use of coined money tell me now

Why would nations in latin america be part of a mostly arab cartel group known as opec? a) latin america refused to do business with countries that were not part of opec. eliminate b) natural resources such as oil are a major economic development for some latin american countries. c) latin america has a long history of distrust of the united states and fears a take-over of oil fields. d) latin american nations such as venezuela needed in getting natural resources to other parts of the world. 15

Why would someone who is studying the history or culture of this time. find this text interesting important or useful?