https://phylogenous.wordpress.com/2011/08/17/book-review-biologys-first-law-by-mcshea-and-brandon-2010/

> The authors spectacularly avoid what they call “colloquial complexity” – what 
> we normally mean when we say complexity – in favor of “pure complexity,” a 
> measure of “number of part types” and “differentiation among parts.” In this 
> sense, a mammalian spine is more complex than a fish spine because there are 
> different kinds of mammalian vertebrae (cervical, thoracic, etc.). The key, 
> however, is that pure complexity is “level-relative.” Just because a 
> mammalian spine is more complex than a fish spine doesn’t mean a mammal is 
> more complex than a fish. Because pure complexity doesn’t scale up 
> hierarchies, comparing two organs to two organisms (or taxonomic classes) 
> doesn’t work. So to get back to the bacteria/human question, we need to 
> compare a bacterial cell to a human cell (not the human organism). That’s how 
> the complexity question actually becomes fascinating, especially because the 
> answer is not quite so clear.

-- 
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