The gas exchange surface in an 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
Gas exchange in earthworm happen through their skin. Earthworm should maintain moist skin so that oxygen from air enters into their capillaries through their skin. Oxygen are carried by their blood to the rest of the body while carbon dioxide is eliminated from the body but it is not carried by haemoglobin.
Thus, the correct answer is option C.

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