Meaning of Vilupt hone in English. How does Extinction look like

More than 99% of the species that lived on Earth totalling more than 5 billion are believed to have gone extinct. According to estimates of the current number of species which ranges between 10 and 14 million, of which, more than 1.2 million species have already been investigated as well as greater than 86% haven´t yet been identified. This can happen naturally as a result of changes in the climate or due to the impact of human activities such as overhunting or the devastation of habitat.