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

1. Myxine
2. Neomyxine
3. Petromyzon
4. Eptatretus

Correct answer: Petromyzon

Solution

Petromyzon is a lamprey: it is jawless, lays eggs in fresh water, and has ammocoetes larvae that metamorphose before the adults return to the sea. The other options are hagfishes, which do not fit this life cycle.

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