How is the study of life span development related to an understanding oflife expectancy?

A. Estimating death rates is the only reason for us to study life expectancy. 
B. Estimating birth rates is the only reason for us to study life expectancy.
C. Life expectancy has no relation to the way we study human development.
D. Life expectancy provides a framework for timing about stages and periods of life.


Answer: D

Psychology

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