Update to remove grammar errors: In conclusion, economics, medicine, architecture, technological inventions and social policies have helped to ease the aging process but they required financial resources to achieve.
The first 100 years of the 21st century have seen the world’s population grow by 2.5 billion people. The world’s population is expected to reach 9.8 billion by 2050.
The world’s population is expected to reach 9.8 billion by 2050. This is a huge increase from the 6.5 billion people that were estimated to be in the world in 2000
The United States has been a leader in the development of technology and science since the 19th century.
In the 19th century, the United States was a world leader in the development of technology and science.
In the 19th century, the United States was a world leader in the development of technology and science.
In the 19th century, the United States was a world leader in the development of technology and science.
In the 19