An analysis of two theories on the variation of life spans: the evolutionary theory and the rate of living theory.
Written in 2000; 2,111 words; 5 sources; $ 66.95
From the Paper:
"A dog is lucky if it lives fifteen years, while an elephant can live beyond sixty years. A certain type of clam can live over 200 years, yet the largest animal on earth, the blue whale, only lives about twelve years. When one looks throughout the animal kingdom, one sees tremendous variation from species to species. One of the most obvious differences between different animals is the discrepancy among the average life spans. There are essentially three stages that make up the life span of an animal (Hayflick 20). They are the developmental, reproductive, and senescence, or aging, stages. Most animals grow until they reach the reproductive stage, after which they began to age and deteriorate. In the wild, animals really only experience the first two stages. As soon as aging occurs and deterioration begins, the animal is at a disadvantage to the other individuals of its species and is more susceptible to predation and other hazards. The animal eventually succumbs to the "survival of the fittest" theory. The only way that an animal is able to experience the effects of aging is through the care of humans who are able to keep it living much longer than it would normally live in the wild. There are two theories on the variation of life spans: the evolutionary theory, which takes into account that nature never really intended animals to age significantly, and the rate of living theory, which states that each animal has a limited amount of energy that is used up during its lifetime."
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