Answer :

Final answer:

The classification of Vertebrata is somewhat questionable for jawless fish because they do not technically have vertebrae. This discrepancy in vertebrate characteristics has led to ongoing disagreement among scientists about their classification.

Explanation:

The classification of Vertebrata is somewhat questionable for jawless fish because while they belong to the subphylum Vertebrata, they do not technically have vertebrae. For example, hagfish belong to the subphylum Vertebrata but lack vertebrae. Lampreys, on the other hand, do have vertebrae. This discrepancy in vertebrate characteristics among jawless fish has led to ongoing disagreement among scientists about their classification.

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