Earthworm has no skeleton. During burrowing anterior end becomes turgid and acts as hydraulic skeleton. It is due to

Gut peristalsis

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Setae

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Coelomic fluid

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Blood.

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Solution

The correct option is D Coelomic fluid
The earthworm has no skeleton but during burrowing, the anterior end becomes turgid and acts as a hydraulic skeleton. It is due to coelomic fluid. The coelom is filled with alkaline, milky coelomic fluid.
So, the correct answer is 'Coelomic fluid'.

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