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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