Multiple Choice
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 ________.
A) structural homologies
B) vestiges
C) structural analogies
D) the result of shared ancestry
Correct Answer:
Verified
Correct Answer:
Verified
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