Question

The disappearance of many species during a relatively short time is known as _____.

Answer 1

Extinction is the disappearance of all members of a species. A species is considered extinct from the moment the last individual dies.

Step-by-step explanation:

Hope this helps

Answer 2

Mass extinction.

Mass extinction is the term used for when a whole species disappears for good. Let's say I have a dinosaur species from tons of years ago. This dinosaur(1) notices something flying toward earth, and suddenly, boom. The dinosaurs all disappear because of a meteor in a short timespan.