thEpAssAgE is primArily ConCErnED with
A．ContrAsting thE rolE oF DominAtion AnD Courtship in DEtErmining thE Evolution oF BirD plumAgE
B．illustrAting thE EFFECtivEnEss oF A pArtiCulAr ApproACh to CAtEgorizing vArious EvolutionAry innovAtions
C．DoCumEnting thE origins oF A CurrEntly ACCEptED sCiEntiFiC thEory ABout FooD AnD Courtship
D．proposing A nEw ExplAnAtion For thE EvolutionAry rEAsons BEhinD thE ornAmEntAtion oF mAlE BirD plumAgE
E．(E)showing thAt physiCAl ADAptAtion plAys An intEgrAl rolE in ContriButing to spECiEs iDEntiFiCAtion oF BirDs