New research has pinpointed the genetic boost behind one of the biggest transformations of life on Earth.
New research suggests that Earth's oxygenation didn't require difficult and complex evolutionary leaps forward.
Drastic oxygen losses in the world's oceans millions of years ago coincided with mass extinctions. Scientists see this as a warning about how climate change could affect oceans today.
Low oxygen levels in the oceans can dramatically change the community of organisms that live there -- but new techniques to re-introduce oxygen have given a breath of life to a Swedish fjord.