Where did the universe come from? Atheistic origin science has no answer.

[downbeatplumb]

Exactly so. It was the production of oxygen that led to the first atmospheric pollution event, as the metabolised free oxygen became more dominant in the atmosphere. It was this which gave rise to the so-called Cambrian Explosion; oxygen is like rocket fuel for life and allowed for multicellular organisms to evolve.

Of course I may have butchered the scenario somewhat, but it's essentially correct.

Indeed the production of oxygen led to a mass extinction that almost wiped out all life.

http://www.damninteresting.com/how-bacte...-all-life/