What are the determine of population change ? list them out.
Answers
Answer:
Fertility, mortality and migration are principal determinants of population growth. Population change depends on the natural increase changes seen in birth rates and the change seen in migration. Changes in population size can be predicted based on changes in fertility (births), mortality (deaths) and migration rates.
Explanation:
How Do Populations Grow and Shrink?
What does 7 billion people look like? It might be hard to imagine that many people, but the world's population actually exceeded that number in 2011. Why are cities more crowded than the countryside? Why do some countries have more people than others? All of these questions are asking about population change, which means the rate at which the population is increasing or decreasing at a given time. In this lesson, we'll go over the three main factors that cause population change: birth, migration, and death. Let's talk about each of these in detail.and death. Let's talk about each of these in detail.
Birth Rate
Now, this might seem very obvious to you, but when babies are born, it results in a population change! Social scientists who study this trend have some key terms, though. First, the fertility rate in a country refers simply to the number of children born. This is different from the fecundity rate, which is the number of children who could be born in a given society. In other words, fecundity is the biological capacity of humans to produce children.
For a woman, this is generally the time frame between her early teens and her mid-forties. For men, this window is longer, but factors like sperm count diminish as a man ages. The fecundity rate is greater than the fertility rate in most cases. Birth rates vary by society for a number of reasons, including personal choice and social and political factors. Factors such as poverty level, access to contraception, maternal and infant care, and availability of nutrition all impact the birth rate in a society.
Death Rate
Just as when babies are born, when members of a society die it changes the population. This might be a bit morbid to think about, but scientists refer to this as the mortality rate, which is simply the number of deaths that occur in a society. This is usually calculated by looking at the number of deaths per 1,000 individuals. In the United States, for example, the death rate is 8/1000 people. Just like birth rate, the death rate in a country depends on things such as availability of quality medical care, disease, war, or famine.