Why We Fall Apart
Biological Theories of Aging
If evolution encourages traits that promote the survival of the species, then why do the natural repair and maintenance capabilities of the body gradually cease to function as individuals age? And why do some animals and plants live so much longer than others? Nature demonstrates immense variability in patterns of aging across different organisms. Understanding how and why aging evolved can shed light on what drives the aging process. Is aging programmed into our genetic blueprint, or is it the result of the accumulation of damage through a lifetime of intraction with the environment? Comparative and evolutionary biology can provide some answers.