Which group includes Hagfish and Lampreys?

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Multiple Choice

Which group includes Hagfish and Lampreys?

Explanation:
Grouping vertebrates by presence or absence of jaws is what this question assesses. Hagfish and lampreys are notable for lacking true jaws, making them jawless fishes. In vertebrate evolution, the emergence of jaws marks a major split, so these two lineages are classified as Agnatha, the jawless fishes. The other groups listed all have jaws: lungfish have jaws, sharks and rays are jawed cartilaginous fishes, and tuna and cod are jawed bony fishes. Therefore, the best fit is jawless fishes (Agnatha).

Grouping vertebrates by presence or absence of jaws is what this question assesses. Hagfish and lampreys are notable for lacking true jaws, making them jawless fishes. In vertebrate evolution, the emergence of jaws marks a major split, so these two lineages are classified as Agnatha, the jawless fishes. The other groups listed all have jaws: lungfish have jaws, sharks and rays are jawed cartilaginous fishes, and tuna and cod are jawed bony fishes. Therefore, the best fit is jawless fishes (Agnatha).

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