Question

1 DEFINE THE TERM DEMONGRAPHY.
2 what happened in the 1800s that led to dramatic human population growth. 3what are the four properties for forecasting human populations? 4 what are the two types of migration and what is the difference between the two? 5 Describe the four stages of demographic transition

Answer 1

1) Define the term demography.
- Demography is the scientific study of human populations — their size, composition (age/sex), spatial distribution, and how they change over time. It examines births, deaths, migration, and the social, economic and biological processes that drive population change.

2) What happened in the 1800s that led to dramatic human population growth?
- The Industrial Revolution and associated developments caused a sharp fall in mortality and a rise in population. Key factors:
- Improvements in medical knowledge and public health (better sanitation, vaccination, control of infectious disease).
- Advances in agriculture (higher yields, improved transport) increasing food supply.
- Improved living standards, housing, and nutrition.
- Technological and transport innovations that supported urbanization and economic growth.
These together reduced death rates much faster than birth rates, producing rapid population growth from the 19th century onward.

3) What are the four properties for forecasting human populations?
- For population projections demographers typically need:
1. The starting population (size and age–sex structure).
2. Fertility (birth rates or age-specific fertility rates).
3. Mortality (death rates or age-specific mortality).
4. Migration (immigration and emigration flows).
Using those inputs (often in age–cohort models) lets demographers forecast future population size and composition.

4) What are the two types of migration and what is the difference between the two?
- Two common ways to categorize migration:
a) By direction: Immigration vs. Emigration
- Immigration = moving into a country or region.
- Emigration = leaving a country or region.
b) By scope: Internal vs. International
- Internal migration = moves within the same country.
- International migration = crossing national borders.
(The first pair answers “two types” most directly; both pairs are useful distinctions.)

5) Describe the four stages of demographic transition.
- Stage 1 — High fluctuating: High birth rates and high death rates; population size is low and stable with slow growth. Typical of pre-industrial societies.
- Stage 2 — Early expanding: Death rates fall rapidly (better health, sanitation), while birth rates remain high; rapid population growth and a youthful age structure.
- Stage 3 — Late expanding: Birth rates begin to decline (urbanization, education, contraception), death rates stay low; population growth slows and age structure starts to balance.
- Stage 4 — Low fluctuating: Both birth and death rates are low; population size is relatively stable and aging. (Some descriptions add a Stage 5: very low birth rates below replacement causing population decline and older populations.)

If you want, I can add examples of countries at each stage or a simple chart showing how birth/death rates change over time.