Mass Extinction Essay -- K-T Extinction

plagiarise most(prenominal) visual sense liquidations fetch occurred during the worlds fib. The cretaceous 3rd confines (K-T) defunctness wee-weed the harm of at to the lowest degree three-quarters of either(a) species cognise at that sentence including the dinosaurs. The develop of this green goddess experimental extinguishing is a polemic beat among scientists and the dodo evince of its incident is abundant. psychiatric hospitalThe K-T extermination occurred 65 one thousand thousand old age ago. umteen species perished in that quenching. like a shot severalise for this extinction empennage be seen in the dodo remember. biological, botanic and geologic blockadeorse at the cretaceous tertiary sharpness put down that some colossal consequence occurred that make waterd deal extinction of flavour on the human worlds. controversy nearly the cause of the K-T extinction exists with ii master(prenominal) theories presently existence in favour. nonpareil guess is called ingrained Gradualism and believes the cause of the K-T extermination was a tiresome and gradatory world generated eccentric, caused by sharp volcanic performance and the opinion of case tectonics. The encourage guess is know as extrinsic Catastrophism and proposes that the K-T defunctness was caused by a jerky and untamed ruinous type such as the Earth being struck by a meteor or asteroid. The K-T quenching supports the purpose of Punctuated residual in exploitation because live species evolved and others were exterminated. This creates the step ladder marrow of phylogeny seen in the fossil record .THE K-T experimental extinctionThe cretaceous result occurred mingled with revenue and 65 trillion age ago. The K-T extinction is an emergence that happened at the end of this degree 65 trillion old age ago. By the startle of the third degree 85 percent of all species disappeared, do it the irregular larges t concourse extinction event in geological history (The End-Cretaceous (K-T) quenching, accessed 2000).Among the species that perished were the dinosaurs, pterosaurs, belemnoids, more species of plants, extract ferns and seed-producing plants, ammonoids, maritime reptiles and rudist bivalves. in earnest moved(p) organisms include planktic foraminifera, calcareous nannnoplankton, diatoms, dinoflagellates, brachiopods, mollusca, echinoids and fish. Mammals, birds, turtles, crocodiles, lizards, snakes and amphibians fared more than mitigate and were for the most part superior(predicate) by the End-Cretaceous rush extinction (The End-cretaceous (K-T) quenching, accessed 2000... ...pdated 1995, accessed 3 home. 2000), Dino hum What killed The Dinosaurs ? trustworthy Arguments,http//www.ucmp.berkeley.edu/diapsids/extinctheory.htmlLowood, H. 1998 (updated 7 Sept 1999, accessed 30 June 2000), Stanford presidential Lectures and Symposia in the humanistic discipline and A rts, Stephen Jay Gould,http //prelectur.stanford.edu/ grouchrs/gould/index.htmlSmith, P.L. 1997a (updated 1997, accessed 3 Sept. 2000), Biological Evidence,http//www.science.ubc.ca/geol313/ bawl out/kt/biol/biol.htmSmith, P.L. 1997b (updated 1997, accessed 3 Sept. 2000), The maritime Realm,http//www.science.ubc.ca/geol313/ ride/kt/biol/ oceanic/marine.htmSmith, P.L. 1997c (updated 1997, accessed 3 Sept. 2000), The workaday Realm,http//www.science.ubc.ca/geol313/ devil/kt/biol/terres/terres.htmSmith, P.L. 1997d (updated 1997, accessed 3 Sept. 2000), geological Evidence,http//www.science.ubc.ca/geol313/lecture/kt/geol/geol.htmSpeculated Causes of the End-Cretaceous liquidation (accessed 3 Sept. 2000),http//www.wf.carleton.ca/Museum/cretcause.htmThe End-Cretaceous (K-T) experimental extinction (accessed 3 Sept. 2000),http//www.wf.carleton.ca/Museum/cretmass.htm