Vertebrates without jaws belong to

Urochordata

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Hemichordata

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Agnatha

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Gnathostomata

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Solution

The correct option is C Agnatha

Agnathans are basically primitive jawless fishes. They include lampreys and hagfishes. They usually have soft, cylindrical bodies that lack scales. They have gill slits for respiration. They have a suctorial or a filter-feeding mouth and they lack jaws.
So, the correct answer is 'Agnatha'.

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