متوسط العمر قطعة قراءة ستيب رقم 81

نص القطعة

1-Population growth rate is how fast a population changes in size over time. There are many factors that influence population change such as birth rate and death rate. One of the most significant factors that can cause growth in population rates is the increase in numbers of young people living and having children. 2-Central Africa has had one of the lowest life expectancies in the world and this is due to many reasons. The leading causes of death in the Central Africa include many diseases such as HIV and AIDS. AIDS has led to a drop in the average of expected lifetime. HIV/AIDS deaths in the Central Africa account for 13 percent of total deaths in the country. 3-We do not know exactly what average life expectancy at birth was in the past, but what we know is that there’s been a rapid increase in life expectancy in many countries throughout this decade. The chief reasons for the increase of life expectancy are the better medical care and the people’s increasing level of education and income.