Based on the information below, which of the following statements is most accurate? Changes in society have driven the emergency-department evolution; for example, population growth has created an increase in emergency-service requests. At the same time, the population is mobile, and in one year a fire station may have calls that strain fire resources, and the next year be only rarely called for structure fires. The demographics can change as well; an older population will affect the number and type of calls received by a fire department.