Answer:
The estimate known as "life expectancy" is how long a living thing (usually people) is expected to live in a given environment. It includes risk factors but not intangibles such as accidents, employment, or warfare.
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Contributor: Mariannee
First answer by Sboone. Last edit by Dfoofnik. Contributor trust: 2559 [recommend contributor recommended]. Question popularity: 8 [recommend question].