The curious minds at What If transport us to the Paleozoic Era and envision what life would be like in this ancient period.

This may have been what life looked like in an oxygen-rich environment during a period of the early Paleozoic Era (541 million years ago to 252 million years ago), showcasing the largest creepy ...

In the middle of what was supposed to be a roughly 480 million year old bedrock from the Paleozoic Era were fossils of plants, invertebrates, and vertebrates, like mammals that lived ...

Yet as animal life diversified into the early Paleozoic era, the history of such interspecies interactions became harder to track. In research published Wednesday in Communications Biology ...