Circular mouth is present in
(A) Labeo
(B) Petromyzon
(C) Scoliodon
(D) All
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Answer. Petromyzon (lampreys) are all carnivorous and are true predators. The method of attack is very peculiar. It attack fishes, turtles etc and it attach themselves by suctorialmouthwhich is circular inshape.
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