Earth has gone through five mass extinction events in its history, each wiping out the majority of life on the planet — and many biologists argue we are currently in the early stages of the sixth, cau

The fossil record contains the unambiguous evidence of five separate occasions on which most of the species alive at the time died, in geological terms, very qu... The fossil record contains the unambiguous evidence of five separate occasions on which most of the species alive at the time died, in geological terms, very qu... Read More