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• Extinction_event abstract "An extinction event (also known as a mass extinction or biotic crisis) is a widespread and rapid decrease in the amount of life on earth. Such an event is identified by a sharp change in the diversity and abundance of macroscopic life. It occurs when the rate of extinction increases with respect to the rate of speciation. Because the majority of diversity and biomass on Earth is microbial, and thus difficult to measure, recorded extinction events affect the easily observed, biologically complex component of the biosphere rather than the total diversity and abundance of life.Over 98% of documented species are now extinct, but extinction occurs at an uneven rate. Based on the fossil record, the background rate of extinctions on Earth is about two to five taxonomic families of marine invertebrates and vertebrates every million years.Marine fossils are mostly used to measure extinction rates because of their superior fossil record and stratigraphic range compared to land organisms.Since life began on Earth, several major mass extinctions have significantly exceeded the background extinction rate. The most recent, the Cretaceous–Paleogene extinction event, which occurred approximately 66 million years ago (Ma), was a large-scale mass extinction of animal and plant species in a geologically short period of time. In the past 540 million years there have been five major events when over 50% of animal species died. Mass extinctions seem to be a Phanerozoic phenomenon, with extinction rates low before large complex organisms arose.Estimates of the number of major mass extinctions in the last 540 million years range from as few as five to more than twenty. These differences stem from the threshold chosen for describing an extinction event as "major", and the data chosen to measure past diversity.".
• Extinction_event wikiPageExternalLink extinct.petermaas.nl.
• Extinction_event wikiPageExternalLink lbl-nem.htm.
• Extinction_event wikiPageExternalLink neo.jpl.nasa.gov.
• Extinction_event wikiPageExternalLink 1.
• Extinction_event wikiPageExternalLink jack.
• Extinction_event wikiPageExternalLink ELE.htm.
• Extinction_event wikiPageExternalLink biofact.html.
• Extinction_event wikiPageExternalLink 060831_KT_biodiversity.html.
• Extinction_event wikiPageExternalLink impacteffects.
• Extinction_event wikiPageExternalLink 050503_mass_extinctions.html.
• Extinction_event wikiPageExternalLink www.speciesalliance.com.
• Extinction_event wikiPageExternalLink cowen1a.html.
• Extinction_event wikiPageExternalLink extinction.html.
• Extinction_event wikiPageExternalLink sixthextinction.html.
• Extinction_event wikiPageID "9813".
• Extinction_event wikiPageRevisionID "604736989".
• Extinction_event hasPhotoCollection Extinction_event.
• Extinction_event subject Category:Climate_forcing_agents.
• Extinction_event subject Category:Climate_history.
• Extinction_event subject Category:Evolutionary_biology.
• Extinction_event subject Category:Extinction_events.
• Extinction_event subject Category:Graphical_timelines.
• Extinction_event subject Category:Hypothetical_impact_events.
• Extinction_event subject Category:Paleontology.
• Extinction_event subject Category:Planetary_science.
• Extinction_event type Abstraction100002137.
• Extinction_event type Chronology106503224.
• Extinction_event type Communication100033020.
• Extinction_event type Event100029378.
• Extinction_event type Evidence106643408.
• Extinction_event type ExtinctionEvents.
• Extinction_event type GraphicalTimelines.
• Extinction_event type ImpactEvents.
• Extinction_event type Indication106797169.
• Extinction_event type PsychologicalFeature100023100.
• Extinction_event type Record106647206.
• Extinction_event type Timeline106504965.
• Extinction_event type WrittenRecord106502378.
• Extinction_event type YagoPermanentlyLocatedEntity.
• Extinction_event comment "An extinction event (also known as a mass extinction or biotic crisis) is a widespread and rapid decrease in the amount of life on earth. Such an event is identified by a sharp change in the diversity and abundance of macroscopic life. It occurs when the rate of extinction increases with respect to the rate of speciation.".
• Extinction_event label "Estinzione di massa".
• Extinction_event label "Extinción masiva".
• Extinction_event label "Extinction event".
• Extinction_event label "Extinction massive".
• Extinction_event label "Extinção em massa".
• Extinction_event label "Masowe wymieranie".
• Extinction_event label "Massa-extinctie".
• Extinction_event label "Massenaussterben".
• Extinction_event label "Массовое вымирание".
• Extinction_event label "انقراض جماعي".
• Extinction_event label "大量絶滅".
• Extinction_event label "生物集群灭绝".
• Extinction_event sameAs Hromadná_vymírání.
• Extinction_event sameAs Massenaussterben.
• Extinction_event sameAs Extinción_masiva.
• Extinction_event sameAs Iraungipen_masibo.
• Extinction_event sameAs Extinction_massive.
• Extinction_event sameAs Kepunahan_massal.
• Extinction_event sameAs Estinzione_di_massa.
• Extinction_event sameAs 大量絶滅.
• Extinction_event sameAs 대량절멸.
• Extinction_event sameAs Massa-extinctie.
• Extinction_event sameAs Masowe_wymieranie.
• Extinction_event sameAs Extinção_em_massa.
• Extinction_event sameAs m.02n_c.
• Extinction_event sameAs Q55814.
• Extinction_event sameAs Q55814.
• Extinction_event sameAs Extinction_event.
• Extinction_event wasDerivedFrom Extinction_event?oldid=604736989.
• Extinction_event homepage biofact.html.
• Extinction_event isPrimaryTopicOf Extinction_event.