One way scientists study a phenomenon is that they change it. In the study of aging, organisms with altered longevity are systems of choice for the unraveling of the biological mechanisms controlling aging. Selection is one of the tools that biologists use to alter the characteristics of organisms, from their size to their shape to their physiology. In this context, it is only natural to strive to alter longevity using selection, as a preamble to detailed analysis of the genetic control of longevity.
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