Earth's simplest organisms are part of the food chain after all

Archaea are some of the most abundant and least understood, organisms on the planet. These single-celled creatures weren't even properly discovered until the 1970s, and big questions about them remain unanswered, such as whether other organisms ever eat them. » 3/13/12 9:45am 3/13/12 9:45am

All multi-cellular life might be descended from a parasitic invasion

Eons ago, two single-celled organisms, a bacterium and an archaeon, combined to form the first complex cell. This symbiosis gave birth to all multi-cellular organisms, but new evidence suggests this wasn't about cooperation. That bacterium was actually a parasite. » 12/19/11 11:40am 12/19/11 11:40am

Meet the ancestor of all living things on Earth

The Last Universal Common Ancestor is the great-grandparent of everything that has ever lived on Earth. Scientists had long assumed it was a crude, simple thing, more a chemical mishmash than anything else. But our earliest ancestor holds some surprises. » 10/06/11 11:00am 10/06/11 11:00am