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Disposable soma
The Disposable soma theory of aging was proposed by Thomas Kirkwood in 1977. The theory suggests that aging occurs due to a strategy in which an individual only invests in maintenance of the soma for as long as it has a realistic chance of survival. A species that uses resources more efficiently will live longer, and therefore be able to pass on genetic information to the next generation. The demands of reproduction are high, so less effort is invested in repair and maintenance of somatic cells, compared to germline cells, in order to focus on reproduction and species survival. A study was done on Seychelles warblers in order to obtain evidence on survival senescence.

(Not sure how to add the picture here but there's a graph and the sentence below is the legend.)

Annual survival probabilities in relation to age, and age of first breeding, in Seychelles warblers older than 6 years.