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    Exam 49: Circulatory Systems
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    Which Group of Vertebrates Is Phylogenetically Oldest and Retains the Ancestral
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Which Group of Vertebrates Is Phylogenetically Oldest and Retains the Ancestral

Question 107

Question 107

Multiple Choice

Which group of vertebrates is phylogenetically oldest and retains the ancestral type of heart?


A) Reptiles
B) Amphibians
C) Fishes
D) Birds
E) Mammals

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