Answer :

Final answer:

The rise in life expectancy since 1930 can be attributed to several factors including improved water and waste systems, changes in public behavior, and advancements in medicine.

Explanation:

The rise in life expectancy since 1930 can be attributed to several factors. The development of systems for providing clean water and proper disposal of waste has helped reduce the transmission of many diseases. Changes in public behavior, such as improved hygiene practices and the reduction of risky behaviors like smoking, have also contributed to better health. Additionally, advancements in medicine, including the development of immunizations and antibiotics, have played a significant role in controlling infectious diseases and extending lives.

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