Introduction In biology, human population growth is defined as the increase of the number of individuals per a population. Human population growth can be affected by several different factors such as life expectancy and fertility rates. Life expectancy and fertility rates are the driving forces behind the growth of human population. Life expectancy refers to the average period in which an individual is expected to live. Fertility refers to the number of children a woman will bear within her lifetime
American people delay their marriage about six years later than 50 years ago. There is a Chinese old saying that marriage is the tomb of love, which shows young people’s hesitation and fear of marriage. What caused this trend? Why has marriage become less attractive today? Is it a phenomenon that happened by accident or an inexorable trend that is happening all over the world? Body The first reason is that as time goes by, people’s minds also develop. Firstly, more and more people prefer to choose