"Extinctionis
the termination of anorganismby
thedeathof
itslast
member.
Ataxonmay
becomefunctionally
extinctbefore
the death of its last member if it
loses the capacity toreproduceand
recover. As aspecies'
potentialrangemay
be very large, determining this
moment is difficult, and is usually
done retrospectively. This
difficulty leads to phenomena such
asLazarus
taxa,
where a species presumed extinct
abruptly "reappears" (typically in
thefossil
record)
after a period of apparent absence."
Source:
Wikipedia
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"Extinction
