Since there is no survival value in an animal' s having an organ that is able to function when all its other organs have broken down to such a degree that the animal dies, it is a result of the efficiency of natural selection that no organ is likely to evolve in such a way that it greatly outlasts the body' s other organs
One car model produced by an automobile manufacturer has a life expectancy that is so much longer than its other models that its great popularity requires the manufacturer to stop producing some of the other models.