In echinoderms, the organs of gaseous exchange are

tube feet

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trachea

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book lungs

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book gills

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Solution

The correct option is A tube feet
In echinoderms, the organs of gaseous exchange are tube feet.
Organisms using trachea for gaseous exchange insects (class Insecta of phylum Arthropoda).
Book lungs as organs of gaseous exchange are used by spiders and scorpions.
Book gills as organs of gaseous exchange are used by living fossil- Limulus.

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