In which of the following animals, respiration occurs without any specialized respiratory organ?

Fish

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Frog

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Cockroach

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Earthworm

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Solution

The correct option is D Earthworm
Earthworms do not have any specialized respiratory organs. They breathe through their skin. The exchange of gases (oxygen and carbon dioxide) takes place through the earthworm's skin by diffusion.
Fish have gills, frogs have lungs and cockroaches have trachea as respiratory organs.
Hence, option D is correct.

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