Ancient microbes tied to our earliest ancestors could use oxygen, reshaping ideas about how complex life began on Earth.

A team led by Brett Baker at the University of Texas at Austin has found that some Asgard archaea, the ancient microbial group most closely related to all complex life on Earth, carried the molecular ...

Learn how oxygen’s early rise could have given complex life the energy boost it needed to evolve.

Aerobic respiration began hundreds of millions of years earlier than previously thought, a new study suggests.

Nighttime drops in ocean oxygen raise energy use in small reef fish. Repeated stress could affect reef health as oceans warm.