What are the causes of demographic change (explain them)

Explanation:

Causes of demographic change. Rapid rates of urban growth were caused initially by migration. ... The pace of migration continued to slow during the 1970s and fell markedly during the 1980s. Migration explained around half of Santiago's growth during the 1960s but only 15 per cent between 1982 and 1992.

the old way of life was represented by superstition, an angry god, and absolute submission to authority. the thinkers of the age of reason ushered in a new way of thinking. this new way championed the accomplishments of humankind. individuals did not have to accept despair. science and reason could bring happiness and progress. kings did not rule by divine right. they had an obligation to their subjects. europeans pondered the implications for nearly a century. americans put them into practice first.

the first question's answer is a.