A) Lampreys and eels
B) Mackerals and rohu
C) Lampreys and hag fishes
D) Guppies and hag fishes
Correct Answer: C
Solution :
Lampreys and Myxine (hag fish) belong to the class-Cyclostomata, group-Agnatha of Vertebrata. Agnatha have mouth without jaws. In these, mouth is ventral, suctorial and circular.
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