"This is the only system on Earth where I could find a microbial mat that worked absolutely in the absence of oxygen."
[https://www.livescience.com/life-on-earth-before-oxygen.html](https://www.livescience.com/life-on-earth-before-oxygen.html)
"This is the only system on Earth where I could find a microbial mat that worked absolutely in the absence of oxygen."
[https://www.livescience.com/life-on-earth-before-oxygen.html](https://www.livescience.com/life-on-earth-before-oxygen.html)