A new study suggests that ancient microbes once cast as oxygen haters may have actually learned to use the gas, offering a ...

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

Scientists propose that eukaryotes formed when an Asgard archaeon entered into a close partnership with an alphaproteobacterium. Over time, the two organisms became permanently linked. The ...

Most days you move through the world without thinking about the invisible creatures that surround you. Yet one of them, a tiny marine organism called Solarion arienae, is quietly reshaping what you ...

In the oceans and on land, scientists are discovering rare, transitional organisms that bridge the gap between Earth’s simplest cells and today’s complex ones.

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

The most widely accepted scientific explanation for the arrival of all complex life on Earth has had an unsolved mystery at its heart. According to the theory, all plants, animals and fungi, known ...