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Statement I: Petromyzon spawns in freshwater.
Statement II: For spawning,Petromyzon has to swim from marine habitat to freshwater against water currents which is mostly aided by the paired fins.

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Statement I is incorrect but statement II is correct.

Statement I is correct but statement II is incorrect.

Both statement I and statement II are correct.

Both statement I and statement II are incorrect.

answer is B.

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Detailed Solution

Cyclostomes are marine but migrate for spawning to fresh water (Migration from marine water to fresh water for spawning is known as Anadromous migration)

Paired fins are absent in Cyclostomes.

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