Q.

The adults are marine but the larva undergoes metamorphosis in freshwater in case of

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a

Ascidia

b

Petromyzon

c

Myxine

d

Trygon

answer is B.

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Detailed Solution

Cyclostomes are marine but migrate for spawning to fresh water. After spawning, within a few days, they die. Their larvae, after metamorphosis, return to the ocean. E.g., Petromyzon (Lamprey).

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