Social Studies, 26.09.2019 22:00, mildred3645

The common ancestors of birds and mammals were very early (stem) amniotes, 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) amniotes, which almost certainly po...