Final answer:
Factors affecting a country's life expectancy include economic circumstances, access to healthcare, diet, lifestyle, and wealth.
Explanation:
Factors that affect a country's life expectancy include economic circumstances, access to healthcare, diet, lifestyle, and wealth. Wealthier and more developed countries tend to have higher life expectancies due to better overall living conditions and healthcare availability. Poverty is a significant factor contributing to lower life expectancies in less developed nations, leading to higher rates of disease, starvation, and infant mortality.
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