Explain the four factors that produce changes in population size.
immigration
war
emigration
birth rate
quality of health care
so many possible factors... I'm not sure you meant "Explain" or "List", if you want explanation, you should of gave us the list of 4 factors.
*Innervation of new & efficiency agriculture technology (more food - worldwide)
*Government intervention (such as the One Child Policy in China)
The four factors that produce changes in population size are birth rate, death rate, immigration, and emigration. Let's break down and explain each of these factors:
1. Birth rate: Birth rate refers to the number of births in a population per unit of time. It is a key factor in population growth. Higher birth rates lead to population increase, while lower birth rates result in population decline. To calculate the birth rate, you need to divide the number of births by the population size and multiply by a factor (usually 1,000) to express it per thousand individuals.
2. Death rate: Death rate is the number of deaths in a population per unit of time. It influences population change by affecting the population's size. Higher death rates lead to population decrease, while lower death rates result in population growth. To calculate the death rate, you need to divide the number of deaths by the population size and multiply by a factor (usually 1,000) to express it per thousand individuals.
3. Immigration: Immigration refers to the movement of individuals into a population from another area. It contributes to population growth as it increases the size of the population. Immigration occurs when individuals move in from a different region or country. The number of immigrants can be estimated by counting the individuals who have entered the population.
4. Emigration: Emigration is the opposite of immigration. It refers to the movement of individuals out of a population to another area. Emigration has a decreasing effect on population size as it reduces the number of individuals in the population. To estimate emigration, you need to count the individuals who have left the population.
By considering the impact of birth rate, death rate, immigration, and emigration, you can get a comprehensive understanding of how and why populations change in size.