The jawless vertebrate is

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
Out of the given options, only Petromyzon is a jawless vertebrate, that is, it is an agnathan. In physical appearance, it resembles an eel. It has a sucker-like mouth that is involved in filter feeding. The rest of the examples are all gnathostomes or jawed vertebrates.
So, the correct answer is 'Petromyzon'.

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