This series of mass extinctions during the Devonian period eventually eliminated about 75 percent of life. However, some of Earth’s oldest fish called coelacanths make it out unscathed.

Earth has already faced five mass extinctions—and scientists say the sixth has begun. Species are vanishing, climates are ...

Though mass extinctions are deadly events ... waters to more readily hold onto dissolved toxic metals. The second worst mass extinction known to science, this event killed an estimated 85 percent ...

View Full Profile. Learn about our Editorial Policies. Most scientists agree that five events in Earth’s history qualify as “mass extinctions”—defined as events where more than three-quarters of ...

That is, the 1 percent of species on Earth not yet extinct: For the last 3.5 billion ... Each mass extinction ended a geologic period — that’s why researchers refer to them by names such as ...

There have been five mass extinctions in the history of time ... age to the Jurrasic period's rising CO2 concentration. In the worst mass extinction event of our time, it's thought an asteroid ...

Asteroid impacts and volcanism have led to mass extinctions on our planet ... Among mollusks, for example, more than 7.5 percent of known species have gone extinct over the last 500 years.

Violent supernovas may have caused two of Earth’s largest mass extinctions that have never ... telescope.The calculations suggested that 2.5 supernovas might affect Earth in some way every ...