Earthworms have no skeleton,but during burrow | vedclass

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(A) The body cavity $(coelom)$ of an earthworm is filled with an alkaline,colourless or milky coelomic fluid containing water,salts,some proteins,and

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Coelomic fluid

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(A) The body cavity $(coelom)$ of an earthworm is filled with an alkaline,colourless or milky coelomic fluid containing water,salts,some proteins,and four types of coelomic corpuscles.During burrowing and locomotion,the contraction of septa (which partition the $coelom$ into a series of coelomic chambers) increases the pressure on the coelomic fluid.This pressure makes the anterior body segment turgid and elongated,allowing it to function as a hydraulic skeleton.

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

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