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...Unit urban ecology structure introduction objectives concept of sociological understanding ecosystems resource and life supporting resources economic the city integration human natural environment challenges for let us sum up key words references suggested readings answers to check your progress st urbanization has become aunstopable global phenomena in century leading a number changes social systems as result are expanding around world people migrate cities population continues move from rural setting now what happens other species these expand how live interact established is central focus over past two decades rapidly expanded simple studies evaluating types present complex investigations characteristics that allow thrive environments according united nations anticipated growth between approximately billion will be concentrated areas un by year more than per cent estimated settlements compared dozen agglomerations have million inhabitants some biggest on planet africa asia latin ame...