Unit

5

Revealing

natureStarting

outWhatwillUnit5beaboutaccordingtothetitle?make(previouslyunknownorsecretinformation)knowntoothersrevealActivity1Lookatthepagefromasciencemagazineandanswerthequestions.1.Whatdoyouknowabouttheseanimals?Komododragon KomododragonswerefirstencounteredbyWesternresearchersin1910.TheresearcherssaidtheancestoroftheKomododragonmostlikelyevolvedinAustraliaandspreadwestward,reachingtheIndonesianislandofFlores900,000yearsago.Komododragon

TheKomododragonisthelargestlizardintheworld.Itcangrowtothreemetresinlengthandcanweighabout135kilograms.Despiteitssizeandweight,itcanrunforshortdistancesatupto20kilometresperhour. Thefirstscientiststoexamineapreservedplatypusbodyjudgeditafakeinthelate18thcentury.Theoldestdiscoveredfossilofthemodernplatypusdatesbacktoabout100,000yearsago.Duck-billedplatypus Theduck-billedplatypusisasmallegg-layingmammal(upto60cminlength)foundonlyinEasternAustraliaincludingTasmania.Asitsnamesuggests,ithasamouththatlookslikeaduck’sbill,whileitsthickfurandflattailaresimilartothoseofabeaver.Duck-billedplatypusNautilus Fossilrecordsindicatethatthenautilushassurvivedrelativelyunchangedforaround500millionyearsLongbeforedinosaursroamedtheEarth.Thatiswhyitisoftenconsidered“livingfossil.”Nautilus Atfirst,

prehistoricnautiluseshadstraightshells,buttheseevolvedintoacoiledshape.Prehistoricnautiluseshadshellsupto10feetinsize.Theydominatedtheseas,asfishhadn'tyetevolvedtocompetewiththemforprey.2.Whatmakestheseanimalsspecial? Theyareallspeciesthatexistthousandsofyearsonearth;Theyareoldandrare(unusual).Activity1Lookatthepagefromasciencemagazineandanswerthequestions.Activity2Watchthevideoandanswerthequestions.Howcanseedstravel?Howcanthisbenefitplants?Seedsusuallytravelbythewind,water,andanimalsorpeople.Plantscanhaveabetterchanceatlife.Howcanseedstravel?Howcanthisbenefitplants?Howcanwelearnfromthenaturalworld?Bybranchingoutandexploringthevariouswondersofnature.Activity3smartexpressions(P65&videoclip)朝西邊蔓延認為…是贗品追溯到一個活化石傳播到很遠的地方旋轉v.洋流硬殼消化系統生存幾率更大朝新方向拓展探索大自然各種各樣的奧秘spreadwestwardsjudge…afakedatebackto…alivingfossiltravelgreatdistancesspin(spin-spun-spun)

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