Oxygen, essential to our existence, took nearly a billion years to appear in significant quantities on Earth, despite the ...

With an opposable big toe resembling a human thumb, the fossilized Burtele foot suggested its owner was a skilled climber, ...

Flight is a rare skill in the animal world. Among vertebrates, it evolved only three times: in bats, birds, and the ...

Now, in a study published Tuesday called "Mystery owner of African hominin foot identified," the scientists announced that ...

A microorganism whose evolutionary roots can be traced to the era of the first multicellular animals may provide a glimpse of how single-celled organisms made a critical evolutionary leap. In ...

With the help of newly identified bones, an enigmatic 3.4-million-year-old hominin foot found in 2009, is assigned to a ...

Single-celled organism harbors protein sensor that was thought to be restricted to multicellular animals. A microorganism whose evolutionary roots can be traced to the era of the first multicellular ...

Choanoflagellates are primitive microorganisms whose evolutionary roots can be traced to the era of the first multicellular animals (metazoans). In December 18 Proceedings of the National Academy of ...