中英都有 　　Theextinctionofdinosaurs 　　Themysteryofdinosaurextinction 　　Morethan200,000,000yearsagointheMesozoic,alargenumberofreptileslivingonland,itisalsoknownastheMesozoic"eraofreptiles,"theearthwasthefirsttooccupyawiderangeofvertebrates.AtthattimetheEarth'sclimatewaswarmer,alloverthedenseforests,reptileshaveenoughfood,graduallyprospered,moreandmorespecies.Theycontinuedtodifferentiateintoavarietyofdifferenttypesofreptiles,someoftodayhasbecomeaturtle,andsometurnedintothetypeofcrocodile,andsometurnedintotoday'ssnakesandlizards,whichareaclassofAroundtheworldandevolvedintotoday'smammals. 　　Allisthedinosaurreptilesinthelargestclassofphysical,verysuitableforlivinginthemarshesandshallowlake,whenwarm,humidair,foodisalsoveryeasytofind.Therefore,dinosaursruledtheearthforseveralmillionyearsoftime,butIdonotknowwhy,intheir6500yearsagoaveryshortperiodoftimeoftheextinctionofasudden,peopleseeonlytheleftbythattimealargenumberofdinosaurfossils. 　　Withregardtothereasonsfortheextinctionofdinosaurs,itisstillbeingstudied.Foralongtime,themostauthoritativeview,andtheextinctionofthedinosaurs6500yearsagoaboutalargemeteorite.Accordingtothestudy,therewasa7-10kmindiameterasteroidwillfallontheearth'ssurface,causingalargeexplosion,suchasthrowingalotofdustintheatmospheretoformtheZhetianbiriHouseofSandandFog,ledtothesuspensionofplantphotosynthesis,Andthereforetheextinctionofthedinosaurs. 　　Asteroidimpacttheoryquicklygainedthesupportofmanyscientists.In1991,inMexico'sYucatanPeninsulaoccurredinthediscoveryofalongperiodofthemeteoriteimpactcraters,thefactisfurtherevidenceofthispointofview.Today,thisviewseemstohavebecomeaconclusion. 　　Buttherearealsomanypeopleforsuchanasteroidimpactontheskeptical,becausethefactis:frogs,crocodilesandmanyotherverysensitivetothetemperatureoftheanimalshaveresistedandsurvivedtheCretaceous.Thistheorycannotexplainwhyonlythedinosaursdied.Todate,scientistshaveputforwardforthecauseoftheextinctionofdinosaurshavebeennofewerthanadozenscenarios,morewealthtothedramaticandexciting,"saidthemeteoritecollision,"butitisoneofthem. 　　Inadditiontothe"meteoritecollision",theextinctionofdinosaursonthemainpointofviewtherearethefollowing: 　　First,climatechange,said.6500millionyearsago,theEarth'sclimatesuddenlychangesinthetemperaturedropped,resultingindecreasedoxygenintheatmospheresothatthedinosaurscouldnotsurvive.Itwasalsosuggestedthatdinosaursarecold-blooded,butwithnohairorwarmorganandcannotadapttotheEarth'stemperaturedropped,werefrozentodeathof. 　　Second,thespecies,saidthefight.Endofthedinosaurera,firstappearedinsmallmammals,theseanimalsarerodentpredatorsmayfeedtoeggs.Asaresultofthislackofsmallanimalpredators,moreandmoreandeventuallyeatuptheeggs. 　　Third,continentaldrift,said.GeologyResearchshowsthatthesurvivalofdinosaursattheageoftheEarth'sonlyapieceofthemainlandonly,thatis,"Pangea."Duetochangesintheearth'scrust,thecontinenttookplaceintheJurassicofthelargerdivisionanddrift,leadingtotheenvironment