All living organisms on Earth share common characteristics or "fundamental properties of life" inherited from the original primordial organism that appeared about 4 billion years ago. Characteristics that differ from species to species, such as the characteristics distinguishing an amoeba from an elephant, are presumed to be the result of the process of evolution, that is, evolved characteristics or adaptations. Life spans of different animals vary dramatically between species and seem to fit with other evolved characteristics such as reproductive behavior. Other peculiarities in life span behavior and recent discoveries such as aging genes and hormone mediated aging further suggest that life span is an evolved characteristic, a part of an organism�s design. However, the traditional theory of natural selection, introduced by Darwin in 1859, is incompatible with an evolved characteristic that limits life span. Darwin�s theory holds that an evolved characteristic must increase an organism�s ability to survive or reproduce. Aging, suicidal behavior, or other characteristic which ......

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