Which statements describe Abū Bakr? Choose three correct answers. He became the first caliph after Muhammad’s death. He was a trusted adviser to Muhammad. He ruled the caliphate during the Umayyad dynasty. He conquered Constantinople and ended the Byzantine Empire. He helped to unite the Arabian Peninsula by conquering remaining Arab tribes

Which of these is not a criticism of the concentric zone model? it does not accurately describe cities after the rise of suburban development. it only applies to cities that grew after the development of the automobile. it assumes that inner-city areas will always be repurposed instead of abandoned. it places too much importance on the traditional central business district.