Answer:30 something generations
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ExplanaIntroductory elements often require a comma, but not always. Use a comma in the following cases: After an introductory clause. After a long introductory prepositional phrase or more than one introductory prepositional phrase.tion:
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Social mobility, movement of individuals, families, or groups through a system of social hierarchy or stratification.
Intragenerational mobility refers to a person's social movements throughout his or her lifespan.
Intergenerational mobility refers to any changes in a family's social position between generations
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