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What does extinction mean?

In biology, "extinction" in a broad sense refers to the phenomenon that all individuals of a certain creature disappear from the earth, and the extinction time of this creature refers to the time when the last individual dies. As for extinction, it mainly includes the following five aspects. If you can't distinguish its concept, it's easy to make a joke.

1. All extinct. Complete extinction refers to the complete disappearance of a species (including all its subspecies) from the earth. Famous extinct animals in the world include dinosaurs, fear birds, mammoths, saber-toothed tigers, archaeopteryx, North American passenger pigeons and so on. These animals can't see their own shadows on the earth, we can only see their specimens or fossils.