Humans in most countries now have a life expectancy of 75 years or more, compared to 30-40 years in the 1800s.German researchers recently found that the average onset of puberty in 1860 was 16.6 years; by 2010, it had dropped to 10.5.These statistics provide evidence that life history changes with

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The increasing life expectancy over time indicates that life history changes with time. The decreasing age of onset of puberty is also a result of changes in environmental conditions and lifestyle factors over time. Therefore, time is the best choice to explain these changes. Genetics and ethnicity may influence certain aspects of life history, but they do not account for such significant changes over time. Life history and reproductive rate are affected by various factors, including genetics, environment, and behavior. However, time is the most prominent factor in explaining the observed changes in life expectancy and age of puberty onset.

Humans in Most Countries Now Have a Life Expectancy of 75