Identify the vertebrate group of animals characterized by the presence of 6-15 pairs of gills for respiration.
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a
Amphibia
b
Chondrichthyes
c
Cyclostomata
d
Osteichthyes
answer is C.
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Detailed Solution
In Cyclostomata 6-15 pairs of gills are present for the respiration. In Osteichthyes 4 pairs of gills are present for the respiration. In Chondrichthyes 5 pairs of gills are present. In Amphibia gills are present only in larval forms.