Did extreme fluctuations in oxygen, not a gradual rise, spark the Cambrian explosion?

(Geological Society of America) Five hundred and forty million years ago, during the Cambrian period, life suddenly went nuts. 'Blossomed' is far too mild a word: instead, geologists call this sudden diversification an 'explosion.' But what exactly sparked the Cambrian explosion?

Source: EurekAlert! - Biology - June 4, 2018 Category: Biology Source Type: news