Respiratory tree is found in_____________.

Holothuroidea

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Echinoidea

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Ophiuroidea

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Crinoidea

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Solution

The correct option is A Holothuroidea
Sea cucumbers (Holothuroidea) “breathe” via hollow, branched, Y-shaped organs called respiratory trees, which lie within the body cavity alongside the intestine.
So, the correct option is A.

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