We can take it for granted that animals need oxygen (even though that is not always true), and have it, so oxygen is a common denominator. ...We tend to think of oxygen as wholesome and good, but in fact from the point of view of primordial biochemistry it is anything but: it is toxic and reactive. As oxygen levels rose, the textbook story goes, this dangerous gas put a heavy selection pressure on the whole microbial world. There are stark tales of the mass extinction to end them all – what Lynn Margulis termed the oxygen ‘holocaust’. (查看原文)
Oxygen forced new relationships between cells – symbioses and endosymbioses, in which cells traded among and within themselves for the tools of survival. (查看原文)
还没人写过短评呢
还没人写过短评呢