whAt is thE BAsis oF thE rEsEArChErs' nEw thEory
A．thEy pErFormED mAthEmAtiCAl CAlCulAtions AnD DEtErminED thAt DinosAurs must hAvE hAD Four ChAmBErED hEArts.
B．thEy FounD A Fossil oF An EntirE DinosAur EnD rEviEwED thE ArtEriEs AnD vEins Flowing From AnD to thE hEArt.
C．thEy FounD A Fossil oF A DinosAur's hEArt AnD DisCovErED it hAD Four ChAmBErs AnD onE AortA.
D．thEy viEwED A Fossil oF A DinosAur's hEArt AnD DisCovErED thAt it hAD two AortAs.