5 percent is the correct answer
<span>The largest mass extinction in Earth's history, the Permian–Triassic extinction event. The effects of this catastrophe were so devastating that it took life on land 30 million years into the Mesozoic to recover.[1] Recovery of life in the sea may have been much faster." </span>
It is surrounded by 5 countries: Austria and Liechtenstein to the east, France to the west and Italy to the south and Germany to the north
