As an Explanation of the Cambrian Explosion, the Oxygen Theory Takes a Lethal Blow

The oxygen idea had already taken blows, including from us, but this would seem to be the end of it. The notion was that rising oxygen levels permitted and therefore somehow spurred the Cambrian explosion, the geologically abrupt emergence of complex animal life less than 600 million years ago. It is as if the possibility of breathing deep was so enticing as to coax a vast infusion of biological information, needed to generate most known animal body plans, from nonexistence into existence. "...