Assertion (A): Cyclostomes are marine but migrate for spawning to freshwater. Reason (R): Larvae of cyclostomes metamorphose in marine water.

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A is correct but R is incorrect

R is correct but A is incorrect

A and R are correct

A and R are incorrect

answer is A.

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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 undergoing metamorphosis return to the ocean.

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