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Birds and mammals lose arches I, II, V, the BLANK1 or most of the BLANK2 side of IV, the dorsal segment of VI on both sides, and the ductus caroticus....

Birds and mammals lose arches I, II, V, the BLANK1 or most of the BLANK2 side of IV, the dorsal segment of VI on both sides, and the ductus caroticus. As a result of modifications in the heart and ventral aorta and deletions in the aortic arches, a system of vessels appropriate for respiration via  BLANK3 is translated phylogenetically and ontogenetically into one suitable for  BLANK4

 respiration.

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left right gills lung


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