does this still hold up? the wikipedia lemma points to several more recent sources that seem to offer counter information https://en.wikipedia.org/wiki/Rare_Earth_hypothesis#Free_oxygen_may_be_neither_rare_nor_a_prerequisite_for_multicellular_life The source of the claim seems to be the book itself, so would need to look it up in Ward Brownlee 2000, page 217

Ward in the context of Rare Earth hypothesis says this. An intriguing notion seeing thinking as a form of (deliberate) movement. How is this meant / to be understood? Chemically, in terms of what it requires in an animal (ie us)? The remark is made in the context of the need for oxygen for complex life to be possible. (based on David Catling Univ of Washington) after all. Or environmentally/contextually, as both deliberate physical movement and brain activity are response to outside impulses?

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So this is a limited BOD sensor for only the subset of organic compounds that E. coli can metabolize?