
Several exoplanets have been discovered to date, and the next step is the search for extraterrestrial life.
Several exoplanets have been discovered to date, and the next step is the search for extraterrestrial life.
The Late Devonian was a protracted period of low speciation resulting in biodiversity decline, culminating in extinction events near the Devonian-Carboniferous boundary. Recent evidence indicates that the final extinction event may have coincided with a dramatic drop in stratospheric ozone, possibly due to a global temperature rise.