Which of the following has remained virtually unchanged through most of history?

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Life span, which is the maximum amount of time an organism can live, has remained virtually unchanged throughout most of history. While factors such as environmental conditions and disease may affect life span to some extent, there is little evidence to suggest that human life span has significantly increased over time. In contrast, life expectancy (the average length of time a person is expected to live) has increased significantly in recent centuries, primarily due to improvements in public health, nutrition, and medical care. Life development and life experience are both subject to considerable variability based on individual circumstances and cultural factors, and have likely changed significantly over time as societies and technology have evolved.

Which of the Following Has Remained Virtually Unchanged Through Most