Well actually, the degradations are 'invisible' to natural selection, so you don't generally notice them util they reach a lethal level. It's the same with the shortening of telomeres.
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Edited by Britton: 5/5/2015 4:39:23 PMBut what evidence is there that happens uniformly over time across an entire species?
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Edited by My Name Is John: 5/5/2015 4:57:00 PMJohn Stanford conducted research on it, it'll be online somewhere but I'm not sure where I'm afraid. I think it was average
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I found a thesis on it. But no experiments.