High Quality Content by WIKIPEDIA articles! In biology and ecology,
extinction is the end of an organism or of a group of organisms
(taxon), normally a species. The moment of extinction is generally
considered to be the death of the last individual of the group
(although the capacity to breed and recover may have been lost
before this point). Because a species' potential range may be very
large, determining this moment is difficult, and is usually done
retrospectively. This difficulty leads to phenomena such as Lazarus
taxa, where a species presumed extinct abruptly "re-appears"
(typically in the fossil record) after a period of apparent
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