The way that Earth's first animals reproduced held back life's diversity for millions of years, until stress and competition ...

For millions of years, some of Earth’s earliest animals barely changed. They lived, grew, and spread across the seafloor, but ...

The simplified summary diagram shows the relative diversity of fossils in the past 2 billion years. Simple eukaryotic cells dominated the first half a billion years. Algae appeared around 1,200 ...

A new study co-authored by researchers at Indiana University sheds light on how the forces that shape mountain ranges also influence the evolution of species. In the study, "Direct effects of mountain ...