Scientists Have Hypothesized That the Common Ancestors of Birds and Mammals

Scientists have hypothesized that the common ancestors of birds and mammals, possessed three-chambered hearts (two atria, one ventricle) . Birds and mammals, however, are alike in having four-chambered hearts (two atria, two ventricles) . Which of the following statements best describes the four-chambered hearts of birds and mammals?

A) they are morphological homologies
B) they exhibit molecular homology
C) they are morphological analogies
D) they are the result of shared ancestry

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