Which strucutres is seen cyclostomes?

Pineal eye

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Jaws

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Pectoral fin

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All of the above

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Solution

The correct option is B Pineal eye
In cyclostomes, the pineal gland is a photoreceptor. The endocrine nature of the gland's function has not been definitely established. As it's activity diminishes with age, the gland turns into rudimentary organ containing mineral deposits.
So, the correct answer is option A.

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