What does extinction mean?

In biology, "extinction" in a broad sense refers to the phenomenon that all individuals of a certain organism disappear from the earth. The extinction time of the organism refers to the time when the last individual dies. Regarding extinction, it mainly includes the following five aspects. If you cannot distinguish the concepts, it will be easy to make a joke.

1. All extinct. Total extinction refers to the phenomenon of a species (including all its subspecies) disappearing from the earth. The famous extinct animals in the world include dinosaurs, moas, mammoths, saber-toothed tigers, Archaeopteryx, North American passenger pigeons, etc. These animals can no longer be seen on the earth, and we can only see their specimens or fossils.