May 6 (UPI) --During the Cambrian explosion, thousands of new species appeared during a relatively short amount of time. The earliest forms of many modern species first emerged during the Cambrian ...

Learn more about a time period marked by an intense burst of evolution. 3 min read The Cambrian period, part of the Paleozoic era, produced the most intense burst of evolution ever known. The Cambrian ...

The most recent 12 percent of time on Earth is a striking anomaly when compared with the great bulk of our planet’s evolution. After 3 billion years or more of Earth as a microbial world, cells found ...

Paleontologists have long studied the fossilized remains of animals from the Cambrian period, a time when many major groups of animals began to evolve. However, finding delicate, soft-bodied embryos ...

The explosion of animal life in Earth's oceans half a billion years ago during and after the Cambrian Period is commonly attributed to a substantial and sustained rise of free oxygen (O2) in seawater.