Biological factor: It indicates two types (A) One is non human biological factor and (B) Second is human biological factor. It is true that both constitute total life on earth.
Mclver and page are the opinion that demographic or biological factors involves (1)size of population (2) structure of population (3) Heredity (4) race (5) Birth rate (6)Death rate (7) fertility (8)sex ratio
Six of population: People are assets, without men and women this society is useless. But the size of population is to balanced. We know that according to Malthus, more population leads to poverty. Similarly optimum size of population, theory explains that there should be balance between population and production of food. It fails we find change in society. To maintain balanced society we want population.
Birth rate and death rate: A high birth rate and low death rate leads to population increase. This brings various problems, like poverty, unemployment, housing problems etc Similar lower birth rate and higher death rate brings changes in society like that of scarcity of human resources, decrease in efficiently. This may create defense rblem in nation.
Migration: It is one of the most influential activities which brings changes in society. Migration means movements of population from one area to another. There are two types of migration (1) Urban rural migration (2) Rural urban migration.
Age and sex ratio: Population constitutes three elements in its structure children, youth and old. In every society the members of below fourteen years and more. But in china due to strick’ One child norm,’ there is decrease in 0-14 years age children ratio. If youth population low economic development.
