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(C) The correct answer is $C$. $Petromyzon$ (Lamprey) is a marine cyclostome that exhibits anadromous migration,meaning it migrates from the ocean to

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After spawning,the adult lamprey stops feeding and migrates back to the ocean where it lives.

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(C) The correct answer is $C$. $Petromyzon$ (Lamprey) is a marine cyclostome that exhibits anadromous migration,meaning it migrates from the ocean to fresh water (rivers) for spawning. After spawning,the adult lamprey dies within a few days and does not migrate back to the ocean. The ammocoete larva,after metamorphosis,migrates from the river to the ocean. $Petromyzon$ possesses a circular,suctorial mouth and acts as a sanguivorous (blood-sucking) ectoparasite on other fishes.

All the following statements are correct about $Petromyzon$ (Lamprey) except:

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