I think the circulatory system is the best body system because we need the heart to stay alive, many people live with only one lung. but we need the respiratory system to let oxygen in, and let carbon dioxide out.
The Internet is a vast network that connects computers all over the world. Through the Internet, people can share information and communicate from anywhere with an Internet connection.
Smoking causes coronary heart disease, the leading cause of death in the U.S. Smoking causes lung cancer and lung diseases including COPD, and Emphysema.
Alcohol can cause brain damage. Binge drinking can cause blackouts, memory loss and anxiety. Long term drinking can result in permanent brain damage, serious mental health problems and alcohol dependence or alcoholism.
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Poverty means people can become desperate and result to violence such as mugging and looting.
