A collection of microbial specimens gathered from a cave located in Romania has displayed a variety of similarities to ...

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.

On the ISS, viruses can still infect bacteria, but the process slows and pushes both organisms to evolve along different paths ...

A global atlas mapping two key gut bacteria in infants around the world has uncovered a treasure trove of bacterial strains ...

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 ...

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 ...

Life on Earth may have learned to breathe oxygen long before oxygen filled the skies. MIT researchers traced a key oxygen-processing enzyme back hundreds of millions of years before the Great ...