The main way in which a cataract can serve as a natural protective barrier is by reducing the amount of UV radiation that enters the eye from sunlight, which is also why it can lead to blindness, however.
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1. Social structures are all around us. In terms of school, we can see a structure within the school staff. For example, a principal is higher in the hierarchy of power than a vice-principal, and a teacher is higher than a teacher assistant.
2. Social structures can be beneficial as they help us structure tasks and distribute power. Hierarchies, when based on merit, can also serve as ways to recognize the accomplishments of people. However, social structures also have negative effects. People can become obsessed with power and control, and abuse those that have less power. Social structures can also make social mobility difficult.
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The transcontinental railroad also brought settlers to the frontier. they brought lumber, wood, people, and other necessities. the railroads also brought settlers and miners who laid claim to Native American land. thus, weakening the Native American hold on the west.
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4 I pick the number 4 for the number 12
