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Which of the following is the best definition of a cohort?a. a group of individuals from the same age group, from birth until they are all deadb. all of the individuals that are annually added to a population by birth and immigrationc. a group of individuals that inhabits a small island region with the range for the speciesd. the reproductive males and females withing a populatione. the number of individuals that annually die or emigrate out of a population

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