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earthworm segmented worm invertebrate phylum annelida diagram labelled parts structure morphology animal anus bilaterally biology body clitellum design dorsal external externally fauna mouth pink prostomium science segments setae soil surface pro vector ventral zoology common garden type annelid invertebrate plays vital role health ecosystem functioning earthworms burrow enhancing fertility increasing aeration drainage nutrient availability aid decomposition consuming organic matter excreting nutrient-rich castings enrich soil