The common ancestors of birds and mammals were very early (stem) reptiles, whichalmost certainly possessed threeÂchambered hearts (two atria, one ventricle). birds andmammals, however, are alike in having fourÂchambered hearts (two atria, two ventricles).the fourÂchambered hearts of birds and mammals are best described as
a) structural homologies.
b) vestiges.
c) homoplasies.
d) the result of shared ancestry.
e) molecular homologies.
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