Question

Which are three main factors that cause population change?

• A. Births, deaths and marriage
• B. Births, deaths and migration
• C. Births, deaths and life expectancy

Answer 1

The correct option is C

Births, deaths and life expectancy

Answer: The correct answer is option (B) – Births, Deaths and Migration

• Birth rate, Death rate, Migration are the factors influencing population change.
• Natural growth rate is the main reason behind the population increase in the world.
• In a country, the natural growth rate is the difference between the birth rate and the death rate.
• Natural causes of population change are deaths and births.
• The number of live births per 1,000 people is the usual way to measure the birth rate.
• The number of deaths per 1,000 people is known as the death rate.
• Migration is the movement of people from one area to another area.
• Immigrants are people who arrive in a country and emigrants are people who leave a country.
• Countries like the USA, Australia and many countries in Europe have increased in population due to immigration, whereas countries like Sudan have reduced population due to emigration.