Which theory of aging proposes that the body breaks down,part by part,after years of use?

A) wear-and-tear
B) secondary aging
C) free-radical hypothesis
D) cellular accident

Wear-and-Tear

A concept referring to the gradual damage or deterioration that occurs in objects, including the human body, as a result of normal use over time.

Cellular Accident

Unexpected and unplanned events at the cellular level that can lead to mutations or cellular damage.