D.) that there are no large urban centers
These factors most likely represent the makeup of a certain civilization or a society at least. They tell you what your society is made up and what does it think and value. Moreover, you get to know how healthy they are and how educated as well.
<span>One important reason why close-ups of people are used in the video is so that the</span> students can be shown how to duck and cover. The video "Duck and Cover" teaches children that when they see a flash, they should duck and cover, so it was necessary to use close-ups of people so that the children can clearly see how to duck and cover.
