why has earthworm been placed in Annelida?
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annelida in latin means "little rings".the body of the earthworm is segmented which looks like many little rings joined or fused together.... segmentation can help the earthworm move each segment or section has muscle and bristles called setae.
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Annelids have two sets of muscles that are used to contract and elongate the body. Annelid worms are excellent examples of a hydrostatic skeleton in the form of a coelom in action. In earthworms, the hydrostatic skeleton or coelom is surrounded by sheaths of longitudinal and circular muscles
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