Why is population the pivotal element in social studies?

Why is population the pivotal element in social studies?

People are most important resource for the development of an economy and society.
They utilises resources and create social and cultural environment.
Population is the pivotal element in social studies because of the fallowing reasons
(i) It is the point of reference from where all other elements are observed.
(ii) Resources, calamities; disasters-all are meaningful only iti relation to human - beings.
(iii) Good health is related to a disease free, population free and a healthy population that is always an asset to a country.