Biology, 11.10.2019 01:00 Rawr5801

The common ancestors of birds and mammals were very early (stem) reptiles, whichalmost certainly possessed threechambered hearts (two atria, one ventricle). birds andmammals, however, are alike in having fourchambered hearts (two atria, two ventricles).the fourchambered 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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The common ancestors of birds and mammals were very early (stem) reptiles, whichalmost certainly pos...