The following is a definition of what? the study of variations and changes in the distribution, makeup, movement, and environmental relationships of a population
a. population geography
b. demography
c. population pyramid
d. cartography
Basically, The main purpose of demography is to require mass Data, such us an effect of Bill A to the people, or average age for drug addiction, etc The result data that acquired by Demographic Study , will be further used by institutions ( could be a corporation, non profit or Governmental institution) to make their decision
