The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed three- chambered hearts (two atria, one ventricle). Birds and mammals, however, are alike in having four- chambered hearts (two atria, two ventricles). The four- chambered hearts of birds and mammals are best described as .
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The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly po...
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