Add Yahoo as a preferred source to see more of our stories on Google. MIT-led research suggests microbes used oxygen hundreds of millions of years before Earth’s Great Oxidation Event. (CREDIT: ...

Some creatures in wildlife carry blue, green, purple or even colourless blood. Discover 10 fascinating animals with the strangest blood colours on Earth.

Aerobic respiration began hundreds of millions of years earlier than previously thought, a new study suggests. Oxygen is a vital and constant presence on Earth today. But that hasn’t always been the ...

Oxygen fills the air today, but for most of Earth’s early history it barely existed. Scientists say the atmosphere did not hold steady oxygen until about 2.33 billion years ago, during the Great ...