1. In 2018 there was 37.9 million people in the world living with HIV/AIDS. This led to 770,00 people dying from the disease. Such a large number of people having the disease effects the population. If a country has a large number of people who have HIV, then the life expectancy can decrease for the population. It's also mostly common in teens and adults so the age ratio will be unbalanced.

2. In 2015 8.9% of the world's population did not improve their water source. Having a dirty water source does not help the population at all. A country could have their main water source be infected by their sewage system. Drinking that will harm the body and kill people who unfortunately don't have another water source.

3. Syria has the highest immigration rate in the world. Out of every 1,000 people, 57 of them will leave the country. Having so many people leave the country will drastically change their population. Entire families are leaving all at once, soon the country will become more open with less people.

 4. The Central Africa Republic (or CAR) has the lowest GDP per capita in the world. The people of CAR won't be able to pay hospital bills if the earn such little money. The people also can't afford better electricity. With a small government that has little money, the people of CAR could try to leave for a new country.

5. Nauru has the highest obesity percentage in the world. 61% of the population is considered obese. With so many people out of shape, their population does not have good health regulations. Unhealthy people die before people who are in great shape. since so many people are out of shape, that means they will die early. When this happens there will be a plunge in the population.

Russia: The majority of the population is in their 30's - 60's. In that age group there are more women than men. With more women that means there is a higher rate of births. It won't be exactly the same to baby boomers in U.S but the population will increase their rate of births.

Brazil: The majority of the population are 10-14 all the way to the 50's. There are more men than women in that age group. many of them are young which will lead to more intercourse with other people. The population will steadily increase.

Peru: The majority of the population are in their 20's. There is an even number of men and women in that age group. Since there are so many young people and a smaller group of older adults, there will be a larger rate of interaction. The population will increase rapidly.

U.K: The population varies but most of them are in their 50's. That is a mildly late age to have kids. Some people will do it but most are already getting ready for their retirement. The population will stay the same.

Italy:  Most of the population is in their 20's. There is an even number men and women in that age group. With so many young people together there will be a large rate of intercourse. The population will increase rapidly.

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