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Earthworms have no skeleton but during burrowing, the anterior end becomes turgid and acts as a hydraulic skeleton. It is due to:

1. coelomic fluid
2. haemolymph
3. gut peristalsis
4. setae

Correct answer: coelomic fluid

Solution

Earthworms lack a rigid skeleton, so they use a pressurized fluid-filled cavity as a hydrostatic support system. The coelomic fluid becomes turgid in the anterior region during burrowing, helping the worm push through soil.

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