Which of the following serves as a covering for mouth and as a wedge to force open cracks in soil into which earthworm may crawl?(a) Peristomium
(b) Prostomium(c) Setae
(d) Clitellum
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the Prostomium a lobe which serves as a covering for the mouth and as a wedge to force open crack in the soil into which earthworm may crawl.
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your answer is (b)prostomium
hope it help
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