Distinguish between:
Birth rate and death rate.
Birth rate and death rate are two components of population change that determine natural growth.
Birth rate relates to births in a population, while death rate relates to deaths. The Natural Growth of Population is calculated as:
Natural Growth = Births – Deaths
When the birth rate is more than the death rate, there is Positive Growth of Population. According to Demographic Transition Theory, both rates change from high births and high deaths to low births and low deaths as society progresses from rural agrarian to urban industrial society.
Push factors and pull factors of migration.
People migrate for a better economic and social life. There are two sets of factors that influence migration.
Push factors operate at the place of origin and compel people to leave. Examples include water shortage, unemployment, and epidemics.
Pull factors operate at the place of destination and attract migrants. Medical/educational facilities is an example of a pull factor. Migration is a spontaneous effort to achieve a better balance between population and resources.
Explanation
The answer uses formulas and concepts from the context: Natural Growth = Births - Deaths, Positive Growth when birth rate exceeds death rate, and demographic transition from high births/deaths to low births/deaths. For migration factors, the answer uses the MCQ examples (water shortage, unemployment, epidemics as push factors; medical/educational facilities as pull factor) and the concepts of place of origin and destination from the context.