painted wolf
Grey Muzzle
Anaerobic life still respires... and you have no way of knowing what evolutionary path it would have taken if oxygen levels hadn't spiked in the early atmosphere.Of course I have but anaerobic life includes only very simple organisms. Evolution from unicellular to multicellular forms of life could not have taken place without respiration.
Just because they are simple now, doesn't mean they would remain so if the limitations of a highly oxygenated atmosphere and competition from oxygen using life were removed.
wa:do