Which statement best explains the population growth in the five cities shown on the graph between 1870 and 1920?

a. many urban industrial jobs were available in the midwest and east regions.
b. profits from the gold rush encouraged the growth of cities on the west coast.
c. african americans sought a better life in the south.
d. many people migrated to the midwest to become farmers.

Astudy that involves interviews of adults is eligible for expedited review. the researcher wants to add an adolescent population (aged 12 to 17) to the study and has designed a parental permission and assent process. no additional changes are planned. which of the following statements about review of the revised protocol is accurate? the research would only be eligible for expedited review if the adolescents are capable of understanding the same consent forms used for the adult population. the research would only be eligible for expedited review if the adolescents have been declared to be emancipated minors. the new research would need full review by a convened irb because children are a protected population. unless the nature of the questions would raise the level of risk to > minimal for adolescents, the research would still qualify for expedited review.