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HED 2340 Exam with Questions and Answers The CDC conducted a study in the late 1970s that examined premature death, which was then defined as any death prior to _____ to _____. A. Age 60; age 70 B. Age 65; age 75 C. Retirement ; life expectancy at birth D. Age 70; life expectancy at birth E. None ANSWER B. Age 65; age 75 When the spread of disease is slowed by a significant portion of the population expressing immunity agasinst the disease is called _______. A. Mass immunity B. Acti...