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Theskullsandpelvicbonesofsomespeciesofdinosaursharecharacteristicswiththeskullsandpelvicbonesofallmodernbirds.Eventhoughnotalldinosaurshavethesecharacteristics,therearescientistswhoclaimthatallanimalsthatdohavethesecharacteristicsaredinosaurs.
Ifthestatementsaboveandtheclaimofthescientistsaretrue,whichofthefollowingmustalsobetrue?
(A)Birdssharemorecharacteristicswithdinosaursthantheydowithotheranimals.
(B)Someancientdinosaurswereindistinguishablefrommodernbirds.
(C)Allanimalswhoseskullssharethecharacteristicsofthoseofmodernbirdsalsohavepelvicbonesthataresimilartothoseofmodernbirds.
(D)Modernbirdsaredinosaurs.
(F)Alldinosaursarebirds.
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Theiceonthefrontwindshieldofthecarhadformedwhenmoisturecondensedduringthenight.Theicemeltedquicklyafterthecarwaswarmedupthenextmorningbecausethedefrostingvent,whichblowsonlyonthefrontwindshield,wasturnedonfullforce.
Whichofthefollowing,iftrue,mostseriouslyjeopardizesthevalidityoftheexplanationforthespeedwithwhichtheicemelted?
(A)Thesidewindowshadnoicecondensationonthem.
(B)Eventhoughnoattemptwasmadetodefrostthebackwindow,theicetheremeltedatthesamerateasdidtheiceonthefrontwindshield.
(C)Thespeedatwhichiceonawindowmeltsincreasesasthetemperatureoftheairblownonthewindowincreases.
(D)Thewarmairfromthedefrostingventforthefrontwindshieldcoolsrapidlyasitdissipatesthroughouttherestofthecar.