Lampreys are

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(B) Lampreys belong to the class $Cyclostomata$ of the phylum $Chordata$.These organisms are characterized by being jawless primitive vertebrates.They

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Jawless primitive vertebrates

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(B) Lampreys belong to the class $Cyclostomata$ of the phylum $Chordata$.These organisms are characterized by being jawless primitive vertebrates.They possess an elongated body bearing $6-15$ pairs of gill slits for respiration.$Cyclostomes$ have a sucking and circular mouth without jaws.Therefore,the most accurate description among the given options is that they are jawless primitive vertebrates.

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