Arrange the following events in the order in which they happened.

the umayyad army crossed the strait
of gibraltar and conquered spain.

muhammad unified most of the arabian
peninsula into a single islamic state.

the europeans attacked the muslim empire
as part of the crusades.

islamic forces conquered mesopotamia by
defeating the byzantine people.

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.