The wear-and-tear theories of aging argue that the body constantly manufactures energy and creates ___________,which eventually reach(es)such high levels as to impair the body's normal functioning.

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The wear-and-tear theories propose that the body generates by-products, such as free radicals and other reactive oxygen species, as a result of normal metabolic processes like energy production, which over time accumulate and damage cells and tissues, contributing to aging and age-related diseases. Radiation, diseases, and toxins are not typically described as products of normal metabolic activity in the same way as by-products are.

The Wear-And-Tear Theories of Aging Argue That the Body Constantly