Collagen, an elastic tissue that becomes less elastic as we get older, is a good example of the __________ theory of aging.

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     wear-and-tear
      active
      cellular clock
      free radical
asked May 17, 2013 in Psychology by anonymous
    

1 Answer

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wear-and-tear
answered May 18, 2013 by ProAnswers ~Top Expert~ (7,505 points)



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