Question

what percentage of all life that has existed on earth has faced extinction? 50 percent 99 percent 0 percent

Explanation:

According to scientific research, over geological time, a vast majority of species that have ever lived on Earth have gone extinct. This is due to various factors like mass - extinction events (such as the Permian - Triassic extinction), gradual environmental changes, and competition. The 99 percent figure is a well - accepted approximation in the field of paleobiology and evolutionary biology.

Answer:

99 percent