Gas exchange surface of Earthworm is

Tracheae

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Gills

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Skin

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Ctenidia

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Solution

The correct option is C Skin
The carbon dioxide molecules diffuse from inside the cell to the outside environment. This gas exchange is vital to an earthworm's ability to live. Earthworms do not have specialized respiratory organs instead, they take in oxygen and expel carbon dioxide directly through their skin.
So the correct answer is 'Skin'.

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