What are the factors of production for a desk

Without george washingtons invention, what aspect of life most likely would be impacted

What from the columbian exchange had perhaps the biggest impact on the world?

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.