question_answer 33)

    Which group of chordates possess sucking and circular mouth without jaws?

Answer:

                  Class-Cyclostomata is comprised of, the living jawless fishes. Their mouth is circular and lack jaws, hence they are also called agnathans. It works like a sucker and is surrounded by tentacles (e.g., lampreys and hellish). These also presses retractable horny teeth.