Which of the following is a jawless vertebrate?

Crocodile

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Loris

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Hyla

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Fox

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Petromyzon

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Solution

The correct option is E Petromyzon
Both Petromyzon (Lamprey) and Myxine (Hagfish) belong to class Cyclostomata of division Agnatha of vertebrates. These animals have a sucking and circular mouth without jaws. They are ectoparasites on fish. Options other than Petromyzon include organisms belonging to either invertebrates or vertebrates with prominent jaws.
So, the correct answer is option E.

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