But in 19th century, life expectancy has improved by over 30 years. By the time, the dramatic changes have been occurred, which caused by three factors. The most significant aspects that affected morality reduction were nutrition, public health measures, and medicine. Human ingested enough nutrition to enhance immune system. Because of that, mortality was reduced. From the mid-18th century to the mid-19th century, economic growth was rapid and people’s diets had been improved. People ingested…
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