A) coelomic fluid
B) blood
C) gut peristalsis
D) setae
Correct Answer: A
Solution :
The body cavity (coelom) of earthworm is filled with an alkaline, colourless or milky coelomic fluid containing water, salts some proteins and four types of coelomic corpuscles, i.e., phagocytes, mucocytes, circular nucleated cells and chloragogen cells. During burrowing, the coelomic fluid becomes turgid and acts as hydraulic skeleton.
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