A jawless fish, which lays eggs in freshwater and whose ammocoetes larvae after metamorphosis return to the ocean is

Eptatretus

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Myxine

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Neomyxine

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Petromyzon

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Solution

The correct option is D Petromyzon
Petromyzon are marine but migrate for spawning to fresh water. After spawning, within a few days, they die. Their ammocoete larvae, after metamorphosis, return to the ocean.
So, the correct option is 'Petromyzon'.

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