Which one of the following helps in respiration of aquatic mammals?

Organ of Corti

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Bursa fabricii

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Gill lamellae

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Retia mirabilia

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Solution

The correct option is D Retia mirabilia
When the arteries and veins lying very close to each other and form complex structure is called as a rete mirabile, found in some vertebrates. In aquatic mammals, a rete mirabile fills the swim bladder with oxygen, increasing the fish's buoyancy.
Thus, the correct answer is option D.

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