extincion
In biology and ecology, extincion is the disappearance of all members of a species or a group of taxa. A species is considered extinct from the moment its last individual dies. Because its potential distribution range can be very large, determining that moment can be difficult, so it is usually done in retrospect. These difficulties can lead to phenomena like the Lazarus taxon, where a species presumed extinct reappears abruptly after a period of apparent absence. In the case of sexually reproducing species, extincion is generally inevitable when only one individual remains, or only individuals of the same sex.
In psychology, extincion is a procedure used in classical and operant conditioning to make a behavior disappear. In educational terms it is applied to undesirable behaviors.
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