Dictionary of Human Evolution and Biology

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Wear-and-tear Theory Of Aging

Proposal that ordinary insults to the tissues of an organism encountered during daily living accumulate with age and eventually reduce in efficiency to a subvital level. At the level of tissues, los of teeth and hair with age are examples. This theory has been reformulated to incorporate new molecular data, and now exists in reformulations such as the DNA damage and repair theory of aging, and similar theories.

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