Trees are a storage for excess carbon and if they are removed put carbon back into the atmosphere. The ocean also takes in carbon but the excess carbon causes acidification in the water. Identify and explain another way that excess carbon could be stored.

A. describe the model of urban structure most often observed in mega-cities in developing countries. explain how this model differs from common urban structures in north america. b. describe at least two factors leading to the growth of mega-cities in developing or least-developed countries. c. identify and explain two factors that led to the formation of squatter settlements in mega-cities in developing countries.