When pearl was in high school, she constantly worried about her relationships and her school achievements. now that she is older, she worries about her health and the environment. this change in the focus of her worrying is due to
a. a basic tendency.
b. temperament.
c. the reticular activation system.
d. characteristic adaptation?

I believe this change in the focus of her worrying is due to D. characteristic adaptation.
As she grew older, she realized that worrying about school and relationships constantly is not really that important, and that there are far more pressing issues in the world around her. Thus, she adapted to her environment and her qualities changed for the better.

Urban growth invariably feeds increased commercialization and industrialization. it requires continually expanding land areas. when urbanization rates are high, and countries do not have the institutional and managerial capacities or economic wherewithal to manage such rapid growths, they exert intense pressure on the types and nature of the resulting settlements. they contribute to the development of overcrowded slums and shanty towns without adequate essential services and necessary infrastructure.-by asit k. biswas and cecilia tortajada