Which group of vertebrates is phylogenetically oldest and retains the ancestral type of heart?
A) Reptiles
B) Amphibians
C) Fishes
D) Birds
E) Mammals

Name: 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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Question

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Fishes are phylogenetically the oldest group of vertebrates and their heart retains the ancestral type, which consists of two chambers.

Which Group of Vertebrates Is Phylogenetically Oldest and Retains the Ancestral